Answer:
The answer is "152.28%".
Explanation:
Formula for ideal gas:
PV=nRT
equation:
[tex]\to (P+\frac{an^2}{v^2})(v-nb)=nRT \\\\a=2.253 \frac{L^2 atm}{mol^2}\\\\b=4.278 \times 10^{-2} \frac{L}{mol}\\\\n=10.68 \ mol\\\\v= 0.8295 \ L\\\\\to (P+\frac{an^2}{v^2})= \frac{nRT}{(v-nb)}\\\\\to (P)= \frac{nRT}{(v-nb)} - \frac{an^2}{v^2} \\\\[/tex]
[tex]= \frac{10.68 \times 0.0082 \times 501.9}{0.8295 - (10.68 \times 4.278 \times 10^{-2})} - \frac{2.253 \times 10.68^2}{0.8295^2}\\\\=\frac{43.9543944}{0.4568904} - \frac{256.982587}{0.68807025}\\\\ = 96.2033661- 373.483067\\\\=-277.279701 \\\\ =-277.279701 \ atm[/tex]
The pressure of gas:
[tex]= (530.3 + 277.279701) \ atm\\\\= 807.579701 \ atm \\\\[/tex]
Calculating the pressure percentage:
[tex]=\frac{807.579701}{530.3} \times 100\\\\= 152.28 \%[/tex]
A student determines that the number of moles in a sample of Al2O3 is 8.3 moles. How many grams are in the sample?
Mass : 846.268 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
mass of Al₂O₃ :
MW 101,96 g/mol
mass=mole x MW
[tex]\tt 8.3\times 101.96=846.268~g[/tex]
1. Which of the following statements describe cations? Select all that apply.
Positively charged ions.
Negatively charged ions.
They have lost electrons.
They have gained electrons.
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option A,C.
What is Ions?
Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Therefore the correct option are option A,C.
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A solution is prepared by dissolving 74.2 g NaI in 527 g of water. Determine the mole fraction of NaI if the final volume of the solution is 565 mL.
a. 8.84 times 10^-2
b. 1.40 times 10^-3
c. 6.04 times 10^-3
d. 1.32 times 10^-2
e. 1.65 times 10^-2
Answer:
The correct answer is option e, that is, 1.65 * 10^-2.
Explanation:
Based on the given information, the weight of NaI given is 74.2 grams and the weight of water given is 527 grams.
The final volume of the solution given is 566 ml.
The formula to calculate the moles is weight/molecular mass,
The moles of NaI will be,
= 74.2/150 = 0.494
Now moles of water will be,
= 527/18 = 29.3
The mole fraction of NaI will be,
= 0.494 / (0.494 + 29.3)
= 0.0165 or 1.65 * 10^-2
Hence, the mole fraction of NaI is 1.65 * 10^-2
Which statement describes effusion?
It occurs when a gas passes through a tiny hole.
It occurs when a liquid passes through a tiny hole.
It occurs when gas molecules disperse throughout a container.
It occurs when a liquid disperses throughout a container.
Answer:
A. It occurs when a gas passes through a tiny hole.
Explanation:
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if 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed?
If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom in each case, is the molecule polar, nonpolar, or does it depend on the identity of the outer atom?
Answer:
It depends on the identity of the outer atom
Explanation:
We must recall that the polarity of a molecule depends on difference In electronegativity between atoms as well as the shape of the molecule.
When a central atom has no lone pairs and all the groups in the molecule are bonding, the identity and arrangement of the outer atoms will determine the polarity of the molecule.
A polar molecule is formed by certain types of outer atoms arranged in certain ways around the periodic table and vice versa.
The identification of the outer atom determines whether the molecule is polar or non-polar. The CH4 compound, for illustration, is a non-polar compound.
There really is no dipole present here because the net dipole moments cancel one another out. As a result, the dipole moment is negligible.
The molecule CH3Cl, for instance, is a polar molecule. There is indeed a dipole force here, and the net polarization isn't zero.
As a result, it exhibits a dipole moment. As a result, the identification of the exterior atom determines whether the molecule is polar or non-polar.
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WHAT PROBLEMS DID PRESIDENT JEFFERSON HAVE WITH TRIPOLI AND HOW DID HE SOLVE THEM
Answer:
Although Thomas Jefferson came to power determined to limit the reach of the federal government, foreign affairs dominated his presidency and pushed him toward Federalist policies that greatly contrasted with his political philosophy. The first foreign episode involved Jefferson's war with the Barbary pirates. For the previous century or so, Western nations had paid bribes to the Barbary states, which would later become Morocco, Algeria, Tunis, and Tripolitania, to keep them from harassing American and merchant ships
Explanation:
The total length of
mid-ocean ridge spreading centers is about 80,000 km. The average
spreading rate of ridges is 1.25 cm/yr. Calculate the area of new
ocean crust that forms each year.
Answer: In fact, all of the major landforms that we find on the continents ... Mid-ocean ridges, also called seafloor-spreading centers, are long, ... 1 km = 100,000 cm or 1 x 105 cm ... a mid-ocean ridge with a SLOW spreading rate (1 to 5 cm/yr, full rate).
Explanation:
As the Earth's tectonic plates separate, new ocean bottom is generated along divergent plate borders, which are known as mid-ocean ridges. Massive basalt volcanic eruptions result from molten rock rising to the seafloor as the plates divide.
What is mid-ocean ridge?A mid-ocean ridge is a system of seafloor mountains formed by plate tectonics. It is typically about 2,600 meters deep and rises about 2,000 meters above the deepest part of an ocean basin. This feature occurs when seafloor spreading occurs along a divergent plate boundary. Mid-ocean ridges are geologically significant because they occur along the type of plate boundary that creates new ocean floor as the plates spread apart. As a result, the mid-ocean ridge is also referred to as a "spreading center" or a "divergent plate boundary." The plates separated at rates ranging from 1 cm to 20 cm per year.To learn more about Mid-ocean ridge, refer to:
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How much ice could be melted at 0°C if 5200 joules of heat were added?
Answer:
0.02kg
Explanation:
Given parameters:
Amount of heat = 5200J
Unknown:
Mass of ice that would be melted at 0°C = ?
Solution:
To solve this problem, use the expression below;
H = mL
H is the heat
m is the mass
L is the latent heat of fusion of ice = 3.33 x 10⁵ J/kg.
Insert the parameters and solve for m;
5200 = m x 3.3 x 10⁵
m = [tex]\frac{5200}{3.33 x 10^{5} }[/tex] = 0.02kg
How does wavelength affect the pitch of a sound?
a. the shorter the wavelength, the lower the pitch
b. the longer the wavelength, the lower the pitch
c. the taller the wavelength, the lower the pitch
d. none of these
Answer:
D
Explanation:
because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch
9) Consider the reaction of C6H6 Br2 C6H5Br HBr a. What is the theoretical yield of C6H5Br if 42.1 g of C6H6 react with 73.0 g of Br2
Answer:
71.7 g of C₆H₅Br are produced at the theoretical yield.
Explanation:
The reaction is:
C₆H₆ + B₂ → C₆H₅Br + HBr
This is an easy excersie, stoichiometry is 1:1
We determine moles of reactants:
42.1 g / 78g/mol = 0.540 moles of benzene
73 g / 159.80 g/mol = 0.457 moles of hydrogen bromide
Certainly, the HBr is the limiting reactant, because I need 0.540 moles of HBr for 0.540 moles of benzene and I only have, 0.457 moles.
0.457 moles of HBr will produce 0.457 of bromobenzene, at the 100 % yield reaction (theoretical yield)
We convert the moles to mass: 0.457 g . 157 g/mol = 71.7 g
The theoretical yield of the reaction has been 0.457 mol.
The balanced chemical equation for the reaction can be given by:
[tex]\rm C_6H_6\;+\;Br_2\;\rightarrow\;C_6H_5Br\;+\;HBr[/tex]
Accordingly, 1 mole of benzene will give 1 mole of Bromobenzene and 1 mole of Hydrobromide.
The moles can be calculated as;
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles in 42.1 grams Benzene:
Moles of Benzene = [tex]\rm \dfrac{42.1}{78}[/tex]
Moles of Benzene = 0.540 mol
Moles of Bromine = [tex]\rm \dfrac{73}{159.80}[/tex]
Moles of Bromine = 0.457 mol.
The limiting reactant in the reaction has been the one that has been present in the lesser quantity as the other reactant to continue to the product formation.
The 1 mole of Benzene requires 1 mole of bromine. So, 0.54 mol of benzene requires. 0.54 mol of bromine. Since the available bromine has been 0.457 mol, Bromine has been the limiting reactant.
The theoretical yield of the reaction will be based on the concentration of Bromine.
Thus, 1 mol of Bromine forms 1 mol of Bromobenzene.
0.457 mol of Bromine will form 0.457 mol of bromobenzene.
The theoretical yield of the reaction has been 0.457 mol.
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A quantity of water vapor at 100°C is condensed to liquid water at the same temperature. In the process, 180,414.08 joules of heat are released. What is the quantity of water that is condensed?
Answer:
0.08kg
Explanation:
Given parameters:
Temperature of water = 100°C
Quantity of heat released = 180414.08J
Unknown:
Quantity of water condensed = ?
Solution:
This is simple phase change process without any attendant change in temperature.
To solve this problem, use the formula below;
H = mL
H is the heat released
m is mass
L is the latent heat of condensation of water = 2260 kJ/kg
Insert the parameters and solve;
180,414.08 = m x 22.6 x 10⁵ J/kg
m = [tex]\frac{180414.08}{2260000}[/tex] = 0.08kg
which is one way that water helps living things?
a temperature regulation
b. oxygen transportation
c. heat absorption
d. nutrient production
Which metal absorbs the greatest amount of heat energy
Answer:
This question is incomplete but the completed question is in the attachment below. And the correct is b
Explanation:
Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.
From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).
QUESTION 4
How many moles are in 3.2 x 1024 of CO2 molecules? (round answer to the correct number of sig figs)
Answer:
5.3 mol CO₂
General Formulas and Concepts:
Chemistry - Stoichiometry
Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.2 × 10²⁴ molecules CO₂
Step 2: Convert
[tex]3.2 \cdot 10^{24} \ mc \ CO_2(\frac{1 \ mol \ CO_2}{6.022 \cdot 10^{23} \ mc \ CO_2} )[/tex] = 5.31385 mol CO₂
Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
5.31385 mol CO₂ ≈ 5.3 mol CO₂
Give the name for the molecular compound with the the formula P2I4.
Answer:
Diphosphorus tetraiodide
Explanation:
Diphosphorus tetraiodide is an orange crystalline solid with the formula P2I4. It has been used as a reducing agent in organic chemistry. It is a rare example of a compound with phosphorus in the +2 oxidation state, and can be classified as a subhalide of phosphorus.
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The name of the molecular compound with the formula [tex]\rm P_2I_4[/tex] is diphosphorus tetraiodide.
The term "compound" refers to two or more elements joined together such that the elements have lost their individual identity in favor of a new set of properties.
The given molecular compound [tex]\rm P_2I_4[/tex] is diphosphorus tetraiodide.
This name is derived from the prefixes "di-" and "tetra-" which indicate that there are two phosphorus atoms and four iodine atoms in the molecule, respectively. The ending "-ide" is used to indicate that the compound is a binary compound consisting of two different elements.Therefore, diphosphorus tetraiodide is the name of the molecular compound with the formula [tex]\rm P_2I_4[/tex] .
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What is accretion?????
Answer:
the process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Explanation:
Answer:
The process of growth or increase, typically by the gradual accumulation of additional layers or matter.
Explanation:
Not sure what to do here. It says to convert the following into formulas and states in an unbalanced equation. Please help!
Answer:
Ca2 solid state
H2O liquid state
Ca(OH)2 I believe this would be in solid state
H2 gas state
Explanation:
If 2.50 ml of vinegar requires 34.50 ml of 0.0960 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in 500.0 ml of this vinegar? Density of vinegar=1.01 g ml
Grams of acetic acid in 500 ml vinegar=39.744 g
Further explanationTitration (equivalence point⇒mol acid(CH₃COOH)=mol base(NaOH))
M₁V₁n₁=M₂V₂n₂(n=valence acid/base, for CH₃COOH and NaOH=1)
[tex]\tt M_1\times 2.5\times 1=0.0960\times 34.5\times 1\\\\M_1(acetic~acid)=1.3248~mol/L[/tex]
For MW CH₃COOH = 60 g/mol, mass of acetic acid in 1 L :
[tex]\tt 1.3428~mol/L\times 60~g/mol=79.488~g/L[/tex]
for 500 ml :
[tex]\tt 79.488\times 0.5~L=39.744~g[/tex]
The mass of vinegar present in 500mL of solution is 39.6 g.
Concentration of acid (CA) = ?
Volume of acid(VA) = 2.50 ml
Concentration of base (CB) =0.0960 M
Volume of base (VB) = 34.50 ml
Number of moles of acid = 1
Number of moles of base = 1
Equation of the reaction;
CH3COOH (aq) + NaOH(aq) ------> CH3COONa(aq) + H2O(l)
From CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CA = CBVBNA/VANB
CA = 0.0960 × 34.50 × 1/2.50 × 1
CA = 1.32 M
Number of moles = concentration × volume
Number of moles = 1.32 M × 500/1000
Number of moles = 0.66 moles
Number of moles = mass/molar mass
Mass = Number of moles × molar mass
Molar mass of acetic acid = 60 g/mol
Mass = 0.66 moles × 60 g/mol
Mass = 39.6 g
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What information would you need to determine the most likely resonance structure for the molecule?
A. The formal charge of each atom
B. The polarity of each covalent bond
C. The Lewis structure of the molecule
D. The bond length of each covalent bond
Answer:
The Formal Charge of Each Atom
Explanation:
I just took the test!
Answer:
A. The formal charge of each atom
Explanation:
Sodium, potassium, and cesium belong to which group?
inner transition metals
halogens
alkali metals
Answer:
Alkali Metals
Explanation:
Find the Molarity of 6.25 grams of barium nitrate dissolved in 250 mL solution.
Answer:
0.0956 M
Explanation:
Step 1: Calculate the moles corresponding to 6.25 g of barium nitrate (solute)
The molar mass of barium nitrate is 261.34 g/mol.
6.25 g × 1 mol/261.34 g = 0.0239 mol
Step 2: Convert the volume of solution to liters
We will use the conversion factor 1 L = 1000 mL.
250 mL × 1 L/1000 mL = 0.250 L
Step 3: Calculate the molarity of the solution
The molarity is equal to the moles of solute divided by the liters of solution.
M = 0.0239 mol / 0.250 L = 0.0956 M
One mole of an atom of a substance is equal to the:
a Gram atomic mass of the element
b Gram molecular mass of the element
C Atomic number of the element
d None of the above
One mole of an atom of a substance is equal to the gram molecular mass of the element. Therefore, the correct option is option B among all the given options.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
A mole consists of precisely 6.022140761023 particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants. One mole of an atom of a substance is equal to the gram molecular mass of the element.
Therefore, the correct option is option B among all the given options.
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When NaCl is dissolved in water, it separates into Na+ and CI-ions, which are also dissolved in water. How would the phase of the NaCl, the Na+, and the CI-
be written in the reaction equation?
A. (g)
B. (1)
C. (aq)
D.(s)
Answer:
C aq
Explanation:
Means desolves in water
When NaCl is dissolved in water, it separates into its constituent ions Na+ and Cl- ions. The phase of the ions are written as (aq) and that of NaCl is written as (s) .
What is NaCl ?Sodium chloride is an ionic compound formed by the transfer of electrons from the metal sodium to the nonmetal chlorine. It is used as the common table salt.
Na contains one valence electron and Cl contains 7 valence electrons. Hence, Na can donate that electron to Cl to achieve octet in both. When Na loss an electron it forms Na+ and Cl gains the electron to form Cl-. These two ions are then attracts to form the NaCl.
When NaCl is dissolved in water the bond between these two ions weaken and the ions gets released into the solution. The ions in the solution is indicated with the phase aqueous (aq) and the undissolved NaCl is in solid (s) state.
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Which is an example of a beneficial mutation?
one that changes the color of a rabbit, allowing it to hide from predators.
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
one that causes a person’s body to produce thick mucus that clogs the lungs
one that makes it easier for a corn plant to contract a disease
Answer:
A
Explanation:
Answer: a
Explanation: one that changes the color of a rabbit, allowing it to hide from predators.
How many liters of fat would have to be removed to result in a 5.2 lb weight loss? The density of human fat is 0.94 g/mL?
The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.
What is volume?The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.
Given,
Mass of body fat = 5.2 lb
Density of human fat = 0.94 g/mL
At first, mass is converted from lb to grams as:
1 lb = 453.592 grams
So, 5.2 lb = 2358.68 grams
Secondly, volume is calculated as:
Volume = Mass ÷ density
V = 2358.68 grams ÷ 0.94 g/mL
= 2509.23 mL
Thirdly, volume from ml is converted to L as:
1 mL = 0.001 L
2509.23 mL = 2.50 L
Therefore, 2.50 liters of body fat has to be removed from the body.
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what is the most likely arrangement of particles in a liquid?
O Farther apart and hire an
energy than those in a gas
O Farther apart and lower energy than those in a solid
O Closer together in lower and energy than those in gas
O Closer together and Lauren energy than those in a solid
Answer:
c. closer together and lower in energy than those in a gas.
Explanation:
In the different states of matter, the arrangement of particles and the kinectic energy that exists in the state of matter varies depending on which state the matter is in.
The particles of Solid are denser and closer than that of liquid. In solid state, the force of attraction between the particles are greater than the kinectic energy of the particles in a solid matter. Therefore, the particles in solid matter are closer together than those in liquid and gas. And also, the energy is lower in Solid matter than those in liquid and gas.
Liquid on the other hand, has denser particles that are closer together than those in gas. Also, liquid particles has lower energy than those in gas.
Particles in gas are more freer and farther apart from each other than the particle sin solid and gas. Also, particles in gas is greater than those in liquid and solid.
Therefore, the likely arrangement of particles in a liquid is that they are:
c. closer together and lower in energy than those in a gas.
What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst?
a. (E)-4-methyl-2-pentene
b. (Z)-4-methyl-2-pentene
c. (E)-2-methyl-2-pentene
d. (Z)-2-methyl-2-pentene
e. 2-methylpentene
Answer:
(Z)-4-methyl-2-pentene
Explanation:
Hydrogenation is a syn addition. This implies that the hydrogen atoms add to the same face of the multiple bond.
Hence, if we have the alkyne, 4-methyl-2-pentyne which reacts with excess hydrogen in the presence of a platinum catalyst, we obtain (Z)-4-methyl-2-pentene since the hydrogen atoms add on the same side of the multiple bond.
What term describes the state of matter in which the attractive forces between particles are the greatest?
liquid
solid
gas
metal
Answer:
I think it would be b
Explanation:
The element fluorine forms a(n) _______ with the charge__________ . The symbol for this ion is____________ , and the name is _____________. The number of electrons in this ion is__________
Answer:
A chemical element exhibiting the symbol F and atomic number 9 is fluorine. It prevails as an extremely toxic pale yellow diatomic gas at normal circumstances and is the lightest halogen. It is exceptionally reactive as it reacts with all the other elements except for helium, argon, and neon, and is the most electronegative element.
Fluorine like halogens produces an anion with a charge of -1 to acquire stability. The symbol for this ion is F-, and the name given to the ion is fluoride ion. The atomic number of fluorine is 9, therefore, the number of electrons in this anion is 9+1 = 10.