The change in energy associated with heating 250.0 g of liquid water from 0.00°C to 100.00°C is 104500 J.
To calculate the change in energy associated with heating 250.0 g of liquid water from 0.00°C to 100.00°C, we need to take into account the energy required to heat the water, as well as the energy required for the phase change from solid to liquid.
First, we need to calculate the energy required to heat the liquid water from 0.00°C to 100.00°C:
q1 = m × c × ΔT
where q1 is the energy required, m is the mass of water, c is the specific heat capacity of water, and ΔT is the change in temperature.
q1 = (250.0 g) × (4.18 J/(g•°C)) × (100.00°C - 0.00°C)
q1 = 104500 J
Next, we need to calculate the energy required for the phase change from liquid to vapor. However, since there is no vaporization of the water, this step is skipped.
Finally, we can add the energy required for heating the water to the boiling point to the energy required for the phase change from solid to liquid:
ΔH = q1
ΔH = 104500 J
Therefore, the change in energy associated with heating 250.0 g of liquid water from 0.00°C to 100.00°C is 104500 J.
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p32 is a radioactive isotope with a half-life of 14.3 days. if you currently have 30.3 g of p32, how much p32 was present 9.00 days ago?
The P³² is the with the half-life of 14.3 days. The currently have the 30.3 g of the P³², the amount of P³² was present in the 9.00 days ago is 56.81 g.
The amount remaining, N = 30.3 g
The Half-life, [tex]t_{1/2}[/tex] = 14.3 days
The Time, t = 9 days
The half-life is the time taken for the concentration of the known reactant that will reach the 50% of the initial concentration.
The Original amount, N₀ =?
The Number of the half-lives, n =?
n = t / [tex]t_{1/2}[/tex]
n = 9 / 14.3
n = 0.629
N₀ = 2ⁿ × N
N₀ = [tex]2^{0.629}[/tex] × 30.3
N₀ = 1.875 × 30.3
N₀ = 56.81 g
The amount of the P³² radioactive isotope is 56.18 g.
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In a parallel circuit, what happens to the overall current of the circuit os the number or recivers (and thus the number of branches) is doubled?
In a parallel circuit, the overall current of the circuit increases when the number of receivers (and thus the number of branches) is doubled.
In a parallel circuit, the current has multiple paths to flow through. Each receiver or branch in the circuit offers a separate path for the current to follow. As a result, the total current flowing into the circuit is divided among the branches. According to Kirchhoff's current law, the total current entering a junction in a circuit is equal to the sum of the currents flowing through each branch. Therefore, when the number of branches is doubled, the total current entering the junction will also double. To put it simply, adding more branches in a parallel circuit increases the number of paths available for the current to flow, reducing the resistance and resulting in an increase in the overall current.
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How is the Nernst equation used to find cell potential in concentration cells?
The Nernst equation that is used to find cell potential in concentration cells is the reaction quotient is used to find the actual cell potential.
The Nernst equation provides the relation between the cell potential of an electrochemical cell, the standard cell potential, temperature, and the reaction quotient. Even under non-standard conditions, the cell potentials of electrochemical cells can be determined with the help of the Nernst equation.
The Nernst equation is often used to calculate the cell potential of an electrochemical cell at any given temperature, pressure, and reactant concentration. The equation was introduced by a German chemist, Walther Hermann Nernst.
Nernst equation can be given by-
E = E⁰ - 2.303 (RT/nF) log Q
where Q = reaction quotient
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which solid conducts electricity most efficiently? responses sugar sugar gold gold graphite graphite sodium chloride
Graphite conducts electricity most efficiently out of the given options. This is because graphite has delocalized electrons that can move freely throughout its layers, allowing for the easy flow of electricity.
Graphite is the material that conducts electricity the best. Sugar is a poor electrical conductor, although copper and salt chloride are also strong conductors.
Copper is the alternative that conducts electricity the best when it comes to solids. A metal called copper is renowned for having good electrical conductivity. While sugar and salt chloride do not conduct electricity well in solid form, graphite also conducts electricity, albeit less effectively than copper. While metals like gold also conduct electricity well, graphite's unique structure gives it an advantage in terms of conductivity. Sugars and sodium chloride do not conduct electricity as they are composed of molecules that do not have free-moving electrons.
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To what temperature will a 50.0 g piece of brass raise if it absorbs 6
kilojoules of heat and its specific heat capacity is 0.38 J/g°C? The initial
temperature of the brass is 20.0°C.
Answer:
335.8⁰C
Explanation:
Q=mc∆t
<=> 6000= 50×0.38×(t-20)
<=> t=335.8⁰C
Fill in answers in the box
Considering the given bonded atoms below:
C-C: number of shared electrons is 2, single bond, non-polarC-Cl: number of shared electrons is 2, single bond, polar What are polar and non-polar bonds?A polar bond occurs when there is a significant difference in electronegativity between two atoms in a molecule.
In a polar bond, the more electronegative atom pulls the shared electrons closer to itself, creating an uneven distribution of charge.
An example of a polar bond is C-Cl.
A non-polar bond occurs when there is little or no difference in electronegativity between the atoms in a molecule. Both atoms have similar or identical electronegativity, leading to a balanced distribution of charge.
An example is the C-C bond.
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The average person in the United States is exposed to the following amount of radiations annually. Rank the following source of radiation in the increasing order of their ability to cause harm to living tissue. Weapons-test fallout 1 millirem Cosmic radiation 26 millirems Air (radon-222) 0. 198 rems Diagnostic X rays 0. 040 rems Television tubes 11 millirems Nuclear medicine 0. 015 rems Ground 33 millirems Rank from highest to lowest. To rank items as equivalent, overlap them
To rank the sources of radiation in the increasing order of their ability to cause harm to living tissue based on the given annual exposure amounts, we can arrange them as follows:
Nuclear medicine: 0.015 rems
Diagnostic X-rays: 0.040 rems
Weapons-test fallout: 1 millirem
Television tubes: 11 millirems
Cosmic radiation: 26 millirems
Air (radon-222): 0.198 rems
Ground: 33 millirems
Ranking them from highest to lowest harm, we have:
Ground (33 millirems) ≈ Cosmic radiation (26 millirems)
Air (radon-222) (0.198 rems)
Weapons-test fallout (1 millirem)
Television tubes (11 millirems)
Diagnostic X-rays (0.040 rems)
Nuclear medicine (0.015 rems)
Please note that this ranking is based on the given annual exposure amounts and the relative potential harm to living tissue. The specific risks and effects of radiation exposure can vary depending on factors such as duration, type of radiation, and individual susceptibility.
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A 4.85*10-3 mole sample of HY is dissolved in enough water to form 0.095L of solution. If the pH of the solution is 2.68, what is the Ka of HY?
The Ka of the dissociation of the monoprotic acid HY is [tex]9.2 * 10^-5[/tex] .
What is the pH of the solution?We know that the acid as we can see it a monoprotic acid and would dissociate to give the hydrogen ion and the anion as we know it.
The concentration of the undissociated acid is; [tex]4.85*10^-3[/tex] /0.095
= 0.05 M
Then we would have that;
[[tex]H^+[/tex]] = Antilog (-2.68)
= 0.0021 M
Equilibrium concentration of the undissociated acid = 0.05 M - 0.0021 M
= 0.0479 M
Ka = [tex](0.0021 )^2[/tex]/( 0.0479)
Ka = [tex]9.2 * 10^-5[/tex]
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for a reaction at equilibirium, which change can increases the rates of the forwards and reverse reactions
For a reaction at equilibrium, increasing the temperature can increase the rates of the forward and reverse reactions
. According to Le Chatelier's principle, an increase in temperature will cause the equilibrium position to shift in the direction that absorbs heat. For an exothermic reaction, this means that the equilibrium position will shift towards the reactants and for an endothermic reaction, it will shift towards the products.
However, since the rates of the forward and reverse reactions are related to the activation energy required for the reaction, increasing the temperature can have a greater effect on the rate of the forward reaction, which typically has a higher activation energy than the reverse reaction. As a result, increasing the temperature can increase the rates of both the forward and reverse reactions, but the effect will be more pronounced on the forward reaction.
It's worth noting that changing the concentration or pressure of reactants and products, or adding a catalyst, can also increase the rates of the forward and reverse reactions, but these changes may not necessarily shift the equilibrium position.
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Watercolor: A painting medium consisting of pigments suspended in a solution of water and gum Arabic.
Gouache: A painting medium similar to watercolor, but opaque
instead of transparent.
Watercolor is a popular painting medium that consists of pigments that are suspended in a solution of water and gum Arabic. The gum Arabic acts as a binder to hold the pigments together, allowing them to be easily applied to paper or other surfaces.
Watercolor paintings are known for their transparency, which is achieved by diluting the pigment with water. However, if the pigment concentration is too high or the water is not mixed properly, the result may be a less transparent painting. This is because the pigments are not fully suspended in the water and gum Arabic solution, causing them to settle and create a more opaque effect. So, it is important to ensure that the pigment and water are properly mixed to achieve the desired level of transparency in a watercolor painting.
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what volume (in ml) of 0.150 m naoh (aq) is required to neutralize 25.0 ml of 0.100 m h2so4 (aq)? (a) 16.7 ml (b) 33.3 ml (c) 66.7 ml (d) 75.0 ml
The volume (in ml) of 0.150M NaOH that is required to neutralize 25.0 ml of 0.100M sulfuric acid is 16.7mL (option A).
How to calculate volume?The volume of a base in a neutralization reaction can be calculated using the following expression;
CaVa = CbVb
Where;
Ca and Va = concentration and volume of acidCb and Vb = concentration and volume of baseAccording to this question, 0.150M NaOH is required to neutralize 25.0 ml of 0.100M sulfuric acid. The volume of sodium hydroxide required can be calculated as follows:
0.150 × Vb = 0.100 × 25
0.15Vb = 2.5
Vb = 16.7mL
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when ph of an aqueous solution is increased from 2 to 10, its hydrogen ion molar concentration undergoes this change:
When the pH of an aqueous solution is increased from 2 to 10, its hydrogen ion concentration decreases.
Generally pH stands for potential hypotenz, and it is defined as the quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term of pH, is widely used in chemistry, biology, and agronomy, because it translates the values of the concentration of the hydrogen ion—which ordinarily ranges between about 1 and 10⁻¹⁴ gram-equivalents per litre—into numbers between 0 and 14.
When pH is increased the solutions become basic as the concentration of hydrogen ions decreases. The range of pH from 2-6 is acidic 7 is neutral and 8-14 is basic.
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find the energy of each photon if the pp and p¯p¯ collide head-on, each with an initial kinetic energy of 730 mevmev . determine the values in the center-of-momentum reference frame.
The energy of each photon created in the annihilation of a proton-antiproton pair with an initial kinetic energy of 730 MeV each is 2.70 x 10^12 eV in the center-of-momentum reference frame.
When a particle and its antiparticle collide, they can annihilate and create photons. In this case, a proton-antiproton pair collide head-on with an initial kinetic energy of 730 MeV each. We need to calculate the energy of each photon created in the center-of-momentum reference frame.
To solve this problem, we need to use the conservation of energy and momentum. The total momentum of the system is zero before and after the collision, and the total energy is conserved.
The rest mass of a proton is 938 MeV/c^2. In the center-of-momentum reference frame, the proton and antiproton have equal and opposite momenta, so their total momentum is zero. The total energy in the center-of-momentum reference frame is given by:
E = 2*(mc^2 + K)
where m is the rest mass of a proton, c is the speed of light, and K is the initial kinetic energy of each particle. Substituting the values, we get:
E = 2*(938 MeV + 730 MeV) = 3376 MeV
This total energy is converted into the energy of the photons created in the annihilation process. The energy of a photon is given by:
E_photon = hf
where h is Planck's constant and f is the frequency of the photon. In the center-of-momentum reference frame, the photons are emitted in opposite directions with equal and opposite energies.
Therefore, each photon carries half of the total energy:
E_photon = E/2 = 1688 MeV
Converting this to electron volts (eV), we get:
E_photon = 1688 MeV * (1.6 x 10^-19 J/eV) = 2.70 x 10^12 eV
Therefore, the energy of each photon created in the annihilation of a proton-antiproton pair with an initial kinetic energy of 730 MeV each is 2.70 x 10^12 eV in the center-of-momentum reference frame.
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A student has three solutions of CsCI at 20 °C. The student tests each solution by adding a small amount of CCI to each solution. The results of each test are recorded in the table below.
Solution
Result
1
More crystals than were added appear at the bottom of the flask.
2
Crystals added settled at the bottom of the flask.
3
No visible solute appears at the bottom of the flask. Based on these results, describe the saturation of each solution before the tests were performed. Explain your reasoning.
Part B
After testing Solution 1 and observing the results, the student cooled Solution 1 to 10 °C. During the cooling, no additional solute came out of the solution.
- Describe the saturation of Solution 1 after it is cooled to 10 °C. Explain your reasoning.
25.0 g of mercury is heated from 25 degrees Celsius to 155 degrees Celsius, and absorbs 455 joules of heat in the process. Calculate the specific heat capacity of mercury
Answer:
Explanation:
specific heat capacity of mercury is approximately 0.14 J/g°C.
we can use the formula:
q = mcΔT
Where:
q = heat absorbed (in joules)
m= mass of the substance(gms)
c = specific heat capacity (in J/g°C)
ΔT = change in temperature (in °C)
In this case, we are given:
q = 455 J
m = 25.0 g
ΔT = (155°C - 25°C) = 130°C
Let’s solve for c by rearranging the formula as:
c = q / (m * ΔT)
Substituting the given values:
c = 455 J/(25.0 g * 130°C)
c = 0.14 J/g°C
Hence we can say that the specific heat capacity of mercury is approximately 0.14 J/g°C.
under identical current and concentration conditions, which of these metal ion solutions would deposit reduced metal mass onto the cathode the fastest
After considering the given options we conclude that the metal ion that will deposit reduced metals is Sn²⁺, which is option B.
The metal ion solution that would deposit reduced metal mass onto the cathode the fastest is the one with the highest reduction potential. The higher the reduction potential of a metal ion, the greater its tendency to get reduced. According to the standard reduction potentials, the order of decreasing reduction potential is:
Sn²⁺ > Pb²⁺ > Cd²⁺ > Ni²⁺ > Ba²⁺
Therefore, Sn²⁺ would deposit reduced metal mass onto the cathode the fastest ⁴.
Reduction potential refers to the measure of the adaptibility of a chemical species to obtain electrons from or lose electrons to an electrode and thereby be reduced or oxidized respectively. It is expressed in volts (V) . In short, it is the count of the tendency of a chemical species to continue reduction.
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The complete question is
Under identical current and concentration conditions, which of these metal ion solutions would deposit reduced metal mass onto the cathode the fastest?
A. Ba2+
B. Sn2+
C. Ni2+
D. Cd2+
E. Pb2+
When 25. 0ml of 0. 05m pb(no3)2 are mixed with 35. 0ml of 0. 01m ki, a yellow precipitate of pbi2(s) forms. A. How many moles of pb2 are initially present? b. How many moles of i- are initially present? c. The concentration of i- is found by analysis to be 3. 75 x 10-3m at equilibrium. How many moles of i- are present in the solution (which has a total volume of 60 ml)? d. How many moles of i- are in the precipitate? e. How many moles of pb2 are in the precipitate? f. How many moles of pb2 are left in solution? g. What is the concentration of pb2 left in the solution at equilibrium? h. Calculate ksp of pbi2 from parts (c) and (g)
In the given scenario, when 25.0 mL of 0.05 M Pb(NO3)2 is mixed with 35.0 mL of 0.01 M KI, a yellow precipitate of PbI2(s) forms.
We can determine the initial moles of Pb2+ and I- present, as well as calculate the moles of I- in the solution, in the precipitate, and left in solution at equilibrium. From these values, we can also calculate the concentration of Pb2+ left in solution and use it to calculate the Ksp of PbI2.
a. To determine the initial moles of Pb2+ present, we multiply the initial volume of Pb(NO3)2 by its molarity.
b. To determine the initial moles of I- present, we multiply the initial volume of KI by its molarity.
c. The moles of I- present in the solution at equilibrium can be calculated by multiplying the equilibrium concentration by the total volume of the solution.
d. The moles of I- in the precipitate can be calculated by subtracting the moles of I- left in solution from the initial moles of I-.
e. The moles of Pb2+ in the precipitate can be determined based on the stoichiometry of the reaction.
f. The moles of Pb2+ left in solution can be calculated by subtracting the moles of Pb2+ in the precipitate from the initial moles of Pb2+.
g. The concentration of Pb2+ left in solution at equilibrium can be calculated by dividing the moles of Pb2+ left in solution by the total volume of the solution at equilibrium.
h. The Ksp of PbI2 can be calculated using the equilibrium concentration of Pb2+ and the concentration of I- left in solution at equilibrium.
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identify the group that is present in n-(hexadecanoyl)-sphing-4-enine.
The group that is present in n-(hexadecanoyl)-sphing-4-enine is the acyl group. An acyl group is a functional group that consists of a carbon atom double-bonded to an oxygen atom and single-bonded to an alkyl or aryl group.
In n-(hexadecanoyl)-sphing-4-enine, the acyl group is hexadecanoyl, which is a 16-carbon chain attached to the sphingosine backbone. This acyl group is derived from palmitic acid, which is a saturated fatty acid commonly found in animal fats and oils. The group that is present in n-(hexadecanoyl)-sphing-4-enine is the acyl group. An acyl group is a functional group that consists of a carbon atom double-bonded to an oxygen atom and single-bonded to an alkyl or aryl group.The presence of the acyl group in n-(hexadecanoyl)-sphing-4-enine plays an important role in its function as a sphingolipid, which are important structural components of cell membranes and also play a role in signaling pathways. The acyl group provides hydrophobic properties to the sphingolipid, which allows it to interact with other lipids in the membrane and maintain its integrity. Overall, the acyl group is a crucial component of n-(hexadecanoyl)-sphing-4-enine and its function as a sphingolipid.
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13. [OH-] = 6.0 x 10-9 M
What is the PH? What is the POH?
Answer: pH = 5.78 POH = 8.22
Explanation for pH: The pH can be found using the formula pH = -log[H+]. To find [H+], we can use the fact that Kw = [H+][OH-] = 1.0 x 10^-14 at 25°C. Solving for [H+] gives [H+] = 1.67 x 10^-6 M. Plugging this value into the pH formula gives a pH of 5.78.
Explanation for POH: The pOH can be found using the formula pOH = -log[OH-]. Plugging in the value of [OH-] gives a pOH of 8.22.
Silicon tetrafluoride gas can be produced by the action of HF on silica according to the following equation. 1.00 L of HF gas under pressure at 3.84 atm and a temperature of 25 °C reacts completely with SiO2 to form SiF4. What volume of SiF4, measured at 15 °C and 0.940 atm, is produced by this reaction?SiO2(g) +4HF(g) -> SiF4(g) + 2H2O
The volume of SiF4 produced by this reaction is 0.961 L when measured at 15 °C and 0.940 atm
To determine the volume of SiF₄ produced, we can use the ideal gas law and the stoichiometry of the reaction:
Convert the initial conditions of HF gas to moles using the ideal gas law:
n(HF) = (P * V) / (R * T)
Use the balanced equation to determine the mole ratio between HF and SiF₄:
4 moles of HF produce 1 mole of SiF₄.
Convert the moles of SiF₄ to volume at the given conditions using the ideal gas law:
V(SiF₄) = (n(SiF₄) * R * T) / P
Given:
Initial conditions:
V(HF) = 1.00 L, P(HF) = 3.84 atm, T = 25 °C = 298 K
Final conditions:
V(SiF₄) = ?, P(SiF₄) = 0.940 atm, T = 15 °C = 288 K
Calculations:
Calculate the moles of HF using the ideal gas law:
n(HF) = (3.84 atm * 1.00 L) / (0.0821 atm·L/mol·K * 298 K)
n(HF) = 0.1607 mol
Determine the moles of SiF4 using the mole ratio:
n(SiF₄) = 0.1607 mol * (1 mol SiF4 / 4 mol HF)
n(SiF₄) = 0.0402 mol
Calculate the volume of SiF4 at the given conditions using the ideal gas law:
V(SiF₄) = (0.0402 mol * 0.0821 atm·L/mol·K * 288 K) / 0.940 atm
V(SiF₄) = 0.961 L
Therefore, the volume of SiF₄ produced by this reaction is 0.961 L when measured at 15 °C and 0.940 atm.
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physio ex describe what happened to the concentration of ions in the urine when pco2 was lowered
The concentration of ions in urine is partly controlled by the partial pressure of carbon dioxide (PCO2) in the blood.
When PCO2 increases, the pH of the blood decreases, making it more acidic. This can lead to an increase in the concentration of ions in the urine.
PhysioEx is a software program used for simulating physiological experiments. One of the experiments related to this question involves the effects of varying PCO2 and pH on renal function.
In summary, PhysioEx simulation results demonstrate that when PCO2 is lowered, the concentration of ions in the urine decreases due to an increase in urine pH. This effect is explained by the relationship between PCO2, pH, and renal function. The interpretation of these results can provide valuable insights into the physiological mechanisms that regulate ion concentration in the urine and their role in maintaining overall body homeostasis.
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for the reaction 2c4h10 (g) 13 o2 (g) → 8 co2 (g) 10 h2o (g) δh° is -125 kj/mol and δs° is 253 j/k ∙ mol. this reaction is ________ A. nonspontaneous at all temperatures B. spontaneous at all temperatures C. spontaneous only at low temperature D. spontaneous only at high temperature E. unable to determine without more information
For the reaction 2 C₄H₁₀ (g) 13 O₂ (g) → 8 CO₂ (g) 10 H₂O (g) δh° is -125 kj/mol and δs° is 253 j/k ∙ mol. This reaction is spontaneous only at high temperatures. Option D is correct.
To determine whether a reaction is spontaneous or not, we use the Gibbs free energy equation, which is ΔG° = ΔH° - TΔS°, where ΔG° is the change in free energy, ΔH° is the change in enthalpy, T is the temperature in Kelvin, and ΔS° is the change in entropy.
If ΔG° is negative, the reaction is spontaneous, meaning it will occur without external intervention. If ΔG° is positive, the reaction is nonspontaneous and will not occur unless energy is added to the system. If ΔG° is zero, the reaction is at equilibrium.
Given the values provided in the question, we can calculate ΔG° at different temperatures using the equation above. At low temperatures, ΔG° will be positive, meaning the reaction is nonspontaneous. However, at high temperatures, the entropy term (TΔS°) becomes dominant, leading to a negative ΔG°, indicating that the reaction is spontaneous. Therefore, the answer is D.
It is important to note that the spontaneity of a reaction depends on the conditions (temperature, pressure, concentration) and the thermodynamic properties of the reactants and products. Additionally, the reaction may be kinetically inhibited, meaning it will not occur even if thermodynamically favorable, due to the activation energy barrier.
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at room temperature, nh3 is a gas and h2o is a liquid, even though nh3 has a molar mass of 17 grams and h2o has a molar mass of 18 grams
At room temperature, NH3 is a gas and H2O is a liquid due to their intermolecular forces and boiling points.The physical state of a substance is not solely determined by its molar mass.
Other factors, such as intermolecular forces, play a significant role. In the case of NH3 and H2O, both substances exhibit hydrogen bonding due to the presence of hydrogen atoms bonded to highly electronegative atoms (N and O).
However, the strength of hydrogen bonding in H2O is greater than that of NH3, resulting in H2O having a higher boiling point and existing as a liquid at room temperature while NH3 remains a gas. Additionally, the size and shape of the molecules also play a role in determining their physical state. H2O molecules are more compact and symmetrical than NH3 molecules, which may also contribute to the difference in their physical states.
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what is the percent yield of iron chloride if we start with 34 g iron bromide and produce 4 g iron chloride?
21.4% is the percent yield of iron chloride if we start with 34 g iron bromide and produce 4 g iron chloride.
Chemistry uses the notion of percent yield to express how effective a chemical reaction or process is. It involves comparing the theoretical yield that is estimated using stoichiometry and other experimental data with the actual yield that is obtained from a reaction. The highest amount of product that can be produced from a specific quantity of reactants, assuming perfect reaction conditions and complete consumption of all reactants, is known as the theoretical yield. The amount of product actually gained by the experimental method, on the other hand, is known as the actual yield.
[tex]\rm FeBr_3 + 3NaCl \rightarrow FeCl_3 + 3NaBr[/tex]
34 g / (276.64 g/mol) = 0.123 moles of [tex]\rm FeBr_3[/tex]
0.123 moles x (162.2 g/mol) = 19.96 g
Percent yield = (Actual yield / Theoretical yield) x 100
Percent yield = (4 g / 19.96 g) x 100 = 21.4%
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how much of a radioactive kind of rhodium will be left after 168 minutes if you start with 878,832 grams and the half-life is 56 minutes
After 168 minutes, there will be approximately 109,854 grams of radioactive rhodium remaining.
To solve this problem, we can use the formula for radioactive decay:
N = N0 * (1/2)^(t/T)
where N is the amount remaining after time t, N0 is the initial amount, T is the half-life, and (^) represents exponentiation.
First, we need to determine how many half-lives have elapsed in 168 minutes.
168 minutes / 56 minutes per half-life = 3 half-lives
So, we can use the formula with t = 3T and solve for N:
N = 878,832 grams * (1/2)^(3)
N = 109,854 grams
Therefore, after 168 minutes, there will be approximately 109,854 grams of radioactive rhodium remaining.
To determine the remaining amount of a radioactive substance, we can use the formula:
Final Amount = Initial Amount * (1/2)^(Time Elapsed / Half-Life)
In this case, the initial amount of rhodium is 878,832 grams, the half-life is 56 minutes, and the time elapsed is 168 minutes. Plugging these values into the formula, we get:
Final Amount = 878,832 * (1/2)^(168 / 56)
First, let's calculate the exponent:
168 / 56 = 3
Now, substitute this value back into the formula:
Final Amount = 878,832 * (1/2)^3
Calculate the power of (1/2)^3:
(1/2)^3 = 1/8
Finally, multiply the initial amount by this factor:
Final Amount = 878,832 * 1/8 = 109,854 grams
After 168 minutes, 109,854 grams of the radioactive rhodium will remain.
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Explain how real gases differ from ideal gases. At what conditions do the variations become the biggest? At room conditions, if you know the condensation point for a series of gases, how will that allow you to predict which gases would vary most from being an ideal gas?
Real gases differ from ideal gases in several ways. Ideal gases are considered to be theoretical gases that have no volume, no attractive or repulsive forces between molecules, and follow the ideal gas law exactly. In contrast, real gases have volume, exhibit intermolecular forces, and deviate from the ideal gas law at certain conditions.
At high pressures and low temperatures, the variations between real gases and ideal gases become significant. This is because real gases tend to occupy more volume due to the intermolecular forces and the finite size of their molecules, which reduces the space available for the gas particles to move around. At low temperatures, the kinetic energy of the gas particles decreases, making the intermolecular forces more significant and causing the gas particles to come closer together.
At room conditions, the variations between real gases and ideal gases are generally small. However, the condensation point of a series of gases can be used to predict which gases would vary most from being an ideal gas. Gases with lower condensation points have weaker intermolecular forces, and are more likely to behave like an ideal gas. In contrast, gases with higher condensation points have stronger intermolecular forces and are more likely to deviate from the ideal gas law.
For example, at room temperature and pressure, nitrogen (N2) and oxygen (O2) are considered to behave like ideal gases because they have low condensation points (-195.8°C and -218.4°C, respectively) and weak intermolecular forces. In contrast, gases like water vapor (H2O) and ammonia (NH3) have high condensation points (100°C and -33.3°C, respectively) and stronger intermolecular forces, and are more likely to deviate from ideal gas behavior.
In conclusion, real gases differ from ideal gases due to intermolecular forces, volume, and deviations from the ideal gas law. The variations become significant at high pressures and low temperatures. At room conditions, the condensation point of a series of gases can be used to predict which gases are more likely to deviate from ideal gas behavior.
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50.0 g of fe was burned in the presence of excess oxygen, 65.0 g fe2o3 was produced. what was the percent yield? 4 fe 3 o2 --> 2 fe2o3 molar mass (g
The percentage yelled of the iron III oxide from the reaction shown is 91%.
What is the percent yield?Percent yield is a measure of the efficiency of a chemical reaction. It represents the percentage of the theoretical yield of the reaction.
Number of moles of the iron = 50 g/56 g/mol
= 0.89 moles
If 4 moles of Fe produces 2 moles of Iron IIII oxide
0.89 moles of Fe will produce
0.89 * 2/4
= 0.445 moles
Mass of the iron III oxide produced = 0.445 moles * 160 g/mol
= 71.2
Percent yield = Actual/Theoretical 8 100/1
= 65/71.2 * 100/1
91%
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given that the path length of the cuvette is 1 cm, what is the extinction coefficient of the 0.020 mm yellow 5 dye at its maximum wavelength?
That a 1 mol/L solution of the 0.020 mm yellow 5 dye would have an absorbance of 0.5 when measured in a 1 cm cuvette at its maximum wavelength.
The extinction coefficient is a measure of how strongly a substance absorbs light at a particular wavelength. In order to calculate it for the 0.020 mm yellow 5 dye, we need to know the absorbance of the dye solution at its maximum wavelength. Once we have that, we can use the Beer-Lambert Law, which relates absorbance to the concentration of the absorbing substance and the path length of the cuvette. The extinction coefficient is then defined as the absorbance of a 1 mol/L solution in a 1 cm path length.
Assuming that we have the absorbance value, we can use the following formula to calculate the extinction coefficient:
Extinction coefficient = (absorbance at maximum wavelength) / (concentration of dye) x (path length of cuvette)
Since the path length of the cuvette is given as 1 cm, and the concentration of the dye is not provided, we cannot give a specific numerical answer to this question. However, if we assume a concentration of 1 mol/L (which is a common reference point for calculating extinction coefficients), then we can use the formula to find the extinction coefficient. For example, if the absorbance at the maximum wavelength is 0.5, then the extinction coefficient would be:
Extinction coefficient = 0.5 / (1 mol/L) x (1 cm) = 0.5 L/mol.cm
This means that a 1 mol/L solution of the 0.020 mm yellow 5 dye would have an absorbance of 0.5 when measured in a 1 cm cuvette at its maximum wavelength.
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which of the following factors describe why h2s is more nucleophilic than h2o?select answer from the options belowelectronegativity atomic number basicity polarizability
The factor that describes why H2S is more nucleophilic than H2O is polarizability. This is because sulfur (in H2S) is larger than oxygen (in H2O) and has more electrons in its outer shell, making it more easily distorted by a positive charge and therefore more nucleophilic.
The factor that best describes why H2S is more nucleophilic than H2O is polarizability. H2S has larger sulfur atoms with more diffuse electron clouds, making it more easily distorted and more likely to form a bond with an electrophile compared to the smaller, less polarizable oxygen atom in H2O.
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A buffer solution is prepared by mixing 250 mL of 1.00 M nitrous acid with 50 mL of 1.00 M sodium hydroxide. Is the resulting solution a buffer solution? Yes or No? What is the pH of the resulting solution? The pKa of nitrous acid is 3.35.
The resulting solution of buffer solution is prepared by mixing 250 mL of 1.00 M nitrous acid with 50 mL of 1.00 M sodium hydroxide is a buffer solution. So, yes, the resulting solution is a buffer solution.
A buffer solution is one with a constant pH, i.e. whose pH doesn't change upon addition of a small amount of acid or base. The resulting solution is a buffer solution because it contains both a weak acid (nitrous acid) and its conjugate base (the nitrite ion formed from the reaction with sodium hydroxide). The addition of sodium hydroxide does not significantly change the pH of the solution due to the presence of the buffer system.
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