Answer:
Chlorine gas is the limiting reactant
11.57 g
Explanation:
The equation of the reaction is;
2Al(s) + 3Cl2(g) -----> 2AlCl3(s)
The limiting reactant will produce the least number of moles of AlCl3.
For Al
Number of moles reacted = 2.43 g/27 g/mol = 0.09 moles
2 moles of Al yields 2 moles of AlCl3
0.09 moles of Al yields 0.09 * 2/2 = 0.09 moles of AlCl3
For Cl2
9.22g/71g/mol = 0.13 moles
3 moles of Cl2 yields 2 moles of AlCl3
0.13 moles of Cl2 yields 0.13 * 2/3 = 0.087 moles of AlCl3
Hence Cl2 is the limiting reactant
b) Mass of product produced = 0.087 moles of AlCl3 * 133g/mol = 11.57 g
Molecular distances are given in picometers, where 1 pm is equivalent to 1 x 10-12 meter.If the distance between carbon atoms in a diamond is 1.54 x 10-8 cm, what is this distance in picometers
Answer:
Distance = 154 pm
Explanation:
Given that,
The distance between carbon atoms in diamond is [tex]1.54\times 10^{-8}\ cm[/tex]
We need to find the distance in pm.
We know that,
[tex]1\ pm=10^{-12}\ m[/tex]
[tex]1.54\times 10^{-8}\ cm=1.54\times 10^{-8}\times 10^{-2}\ m\\\\=1.54\times 10^{-10}\ m[/tex]
Multiplying and dividing by 10⁻².
[tex]d=1.54\times 10^{-10}\times \dfrac{10^{-2}}{10^{-2}}\\\\=154\times 10^{-12}\ m\\\\=154\ pm[/tex]
So, the distance is 154 pm.
Describe how you would make 800.0 mL of a 0.400 M NaOH solution from a 17.0 M stock NaOH solution. Express your answer with the appropriate units.
Answer:
By taking 18.8 mL of the stock solution and adding about 781.2 mL of water to obtain the desired dilution
Explanation:
Hello there!
In this case, for this dilution problem, it will be possible for us to calculate required volume of the stock NaOH solution by considering that the moles of this solute remain unchanged so we can use the following equation:
[tex]M_1V_1=M_2V_2[/tex]
Whereas the subscript 1 stands for the stock solution and 2 for the dilution. In such a way, we solve for the volume of the former, V1, as shown below:
[tex]V_1=\frac{M_2V_2}{M_1} \\\\V_1=\frac{800.0mL*0.40M}{17.0M}\\\\V_1=18.8mL[/tex]
It means we take 18.8 mL of the stock solution and add about 781.2 mL of water to obtain the desired dilution.
Regards!
Please help and explain how to do it need the answer asap, please.
Answer:
45 and 20 c2 Or4
Explanation:
A student is creating a model of space and wants to include the Earth, the Milky Way galaxy, the universe, and the
solar system. How should the student scale the components of the model to make an accurate model? Select the
FOUR statements that apply.
A)
The universe should be the largest component of the model.
B)
The Earth should be a smaller component within the solar system.
C)
The solar system should be scaled smaller than the Milky Way galaxy.
D)
The solar system should be larger than the Earth but not larger than the
Milky Way
E)
The Milky Way should be larger than the Earth but smaller than the solar
system.
Answer:
the solar system should be larger than earth but not larger than the milky way
The universe is made of billions of galaxies, stars, planets, satellites of these planets dark matter and other small objects. Universe being the largest in the model and then milky galaxy in which the solar system is one component and the smallest in the model is earth.
What is galaxy?Galaxy is a group of stars, dust and dark matter connected with a gravitation pull. The Universe is made of billions of galaxies in which the one which is near to the earth is called milky-way.
There are number of planets in the universe and some of them are not identified yet. The solar system is a group of planets which revolving around the sun.
Earth is one planet in the solar system. Galaxies are bigger than solar system. Thus in the model earth being the smaller component and solar system smaller than milky way.
Universe be the largest in this model containing all these galaxies, solar system and planets. Hence the options A, B,C and D are correct.
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A chemistry student needs 90.00 g of thiophene for an experiment. She has available 0.50 kg of a 12.3% w/w solution of thiophene in ethanol.
Calculate the mass of solution the student should use. If there's not enough solution, press the 'No solution" button
Round your answer to 3 significant digits. Put the answer in terms of the amount of grams.
Answer: The correct answer is No solution.
Explanation:
We are given:
Given mass of thiophene for the experiment = 90.00 g
12.3% w/w solution of thiophene
This means that 12.3 g of thiophene is present in 100 g of solution
Applying unitary method:
If 12.3 g of thiophene is present in 100 g of solution
So, 90.00 g of thiophene will be present in [tex]\frac{100g}{12.3g}\times 90.00g=731.7g [/tex] of solution
Converting it into kilograms:
1 kg = 1000 g
So, 731.7 g = 0.7317 kg
As the given amount of solution is 0.50 kg which is less than the required amount.
Thus, there is not enough solution the student should use.
What is the value of delta G at 292 for a reaction in which deltaH = 92 kj/mol and delta S= 2.38 kj/mol K
Answer: The value of [tex]\Delta G[/tex] is -602.96 kJ/mol at 292 k for a reaction in which [tex]\Delta H[/tex] = 92 kj/mol and [tex]\Delta S[/tex] = 2.38 kj/mol K.
Explanation:
Given: Temperature = 292 K
[tex]\Delta H[/tex] = 92 kJ/mol
[tex]\Delta S[/tex] = 2.38 kJ/mol
Formula used to calculate the value of [tex]\Delta G[/tex] is as follows.
[tex]\Delta G = \Delta H - T\Delta S[/tex]
Substitute the values into above formula as follows.
[tex]\Delta G = \Delta H - T\Delta S\\= 92 kJ/mol - (292 K \times 2.38 kJ/mol K)\\= 92 kJ/mol - 694.96 kJ/mol\\= - 602.96 kJ/mol[/tex]
Thus, we can conclude that the value of [tex]\Delta G[/tex] is -602.96 kJ/mol at 292 k for a reaction in which [tex]\Delta H[/tex] = 92 kj/mol and [tex]\Delta S[/tex] = 2.38 kj/mol K.
Climate change as we know it today is
characterized by a(n) __change in the
earth's temperature.
slow
abrupt (sudden)
rough
How many formula units are there in 14.50 moles of Ba(NO2)2?
Answer:
I am pretty sure that there is 3325.401 formula units. I might be wrong. Hope this helps!
Explanation:
Name the functional group in the
following molecule:
HÖCH2CH2CH3
A, ketone
B, aldehyde
C. ester
D, alcohol
Answer:
aldehyde
Explanation:
ou discover that the complex decomposes in water. When 0.1000 g of the complex is dissolved in water with excess NaHg(SCN)4, all of the Co(II) is precipitated as CoHg(SCN)4 (s). After the precipitate is washed and dried, its mass is found to be 0.1102 g. How many grams of cobalt are contained in the original 0.1000 grams of the complex
Answer:
6.28x10⁻³ g
Explanation:
First we convert 0.1102 grams of CoHg(SCN)₄ into moles, using its molar mass:
0.1102 g ÷ 491.9 g/mol = 2.24x10⁻⁴ mol CoHg(SCN)₄There is 1 Co mol per CoHg(SCN)₄ mol, meaning there's also 2.24x10⁻⁴ moles of Co.
We now convert 2.24x10⁻⁴ moles of Co into grams, using its molar mass:
2.24x10⁻⁴ mol Co * 28.01 g/mol = 6.28x10⁻³ gFor the following electrochemical cell, determine the oxidizing agent, reducing agent, and whether the cell is a voltaic cell or electrolytic cell.
Fe(s) / Fe2 (aq) (1.0 M) // Ni2 (aq) / Ni(s).
a. NiB.
b. Ni2+
c. Fe
d. Fe2+
e. voltaic
f. electrolytic
PLZ HELP ASAP!!!
What is the percent by mass of CaCl2, when 35 grams are dissolved in enough water to produce 3 kg of solution?
A) 12%
B) 8.6%
C) 86%
D) 1.2%
Answer:
A) 1.2%
Explanation:
2.50 g of CO2 gas is confined in a rigid cylinder at a pressure of 4.65 atm. If 0.42 g of gas is released from the cylinder, what is the new pressure?
Answer:
5.59atm
Explanation:
boyles law
P1V1=P2V2
4.65×2.5=P2×(2.5-0.42)
11.625=P2×2.08
P2=5.59atm
A voltaic cell consists of an Mn/Mn2 half-cell and a Pb/Pb2 half-cell. Calculate [Pb2 ] when [Mn2 ] is 1.1 M and E cell is 0.44 V.
Answer:
[Pb²⁺] = 2.31x10⁻²¹ M
Explanation:
Let's write the semi reaction for each half cell:
Pb²⁺ + 2e⁻ -----------> Pb(s) E° = -0.13 V
Mn²⁺ + 2e⁻ ----------> Mn(s) E° = -1.18 V
As we can see, the E° of Pb is higher than the E° of the Mn, thus, Pb is reducting and Mn is oxidizing:
Pb²⁺ + 2e⁻ -----------> Pb(s) E°₁ = -0.13 V
Mn(s) ---------> Mn²⁺ + 2e⁻ E°₂ = +1.18 V
E° = E°₁ + E°₂
E° = -0.13 + 1.18 = 1.05 V
Now, we can use the Nerst equation which is:
E = E° - 0.059/n log([Mn²⁺] / [[Pb²⁺])
From here, we just need to replace and then, solve for the [Pb²⁺]:
0.44 = 1.05 - 0.059/2 log(1.1 / x)
0.44 - 1.05 = -0.0295 log(1.1 / x)
-0.61 / -0.0295 = log(1.1 / x)
antlog(20.678) = 1.1 /x
x = [Pb²⁺] = 1.1 / 4.76x10²⁰
[Pb²⁺] = 2.31x10⁻²¹ MHope this helps
What is the maximum amount of Kl that can be dissolved in 100 g H2O at 20C
Answer: azada calva
Explanation:
What’s a chemical property
Answer:
A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.
Today, nuclear power plants rely on fission. While fusion reactions have been used in nuclear bombs, many scientists and engineers hope that in the future we can use fusion to produce energy. What are some possible advantages of fusion energy over fission energy?
Explanation:
nuclear fusion yields more energy than nuclear fission and the products of the reaction are not radioactive
When the two nuclei merge to form a single nucleus is called fusion and the splitting of the nucleus to form two nuclei is called fission. Fusion can create more energy.
What is the difference between Nuclear fusion and fission?Nuclear fusion and fission are the nuclear reactions that yield energy as the end product. They are different as fusion is the combination of two nuclei and fission is the splitting of the two nuclei.
Fission involves the decay of radioactive substances and formation of the energy. It is used for the formation of nuclear power plants and fusion is involved in the production of the bombs.
Fusion is the more powerful reaction that occurs in the sun and can yield more energy as compared to fission reactions. It is more advantageous as the radioactive substances are not formed at the end of the reaction.
Therefore, fusion is more powerful than fission.
Learn more about fusion and fission here:
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How many moles of NH3 are produced when 0.45 moles of H2 gas react
with N2 gas? N2 + 3H2 -->2 NH3 (mole to mole conversion)
Answer:
[tex]\boxed {\boxed {\sf 0.3 \ mol \ NH_3}}[/tex]
Explanation:
We need to use stiochiometry and a mole to mole conversion to solve this problem.
First, examine the chemical equation. Make sure it is balanced before doing any calculations.
[tex]N_2+3H_2 \rightarrow 2NH_3[/tex]
It is balanced, so we can also use the coefficients to refer to molar amounts.
So, the equation is also saying that 1 mole of N₂ (no coefficient implies 1) and 3 moles of H₂ react to form 2 moles of NH₃.
[tex]1 \ mol \ N_2 + 3 \ mol \ H_2 \rightarrow 2 \ mol \ NH_3[/tex]
Now we can use this information to make a ratio. We know that we have 0.45 moles of hydrogen, and we are trying to find the moles of ammonia.
According to the original equation, 3 moles of hydrogen produce 2 moles of ammonia. Let's make a ratio.
[tex]\frac {3 \ mol \ H_2}{2 \ mol \ NH_3}[/tex]
We have 0.45 moles of hydrogen, so multiply by that number.
[tex]0.45 \ mol \ H_2 *\frac {3 \ mol \ H_2}{2 \ mol \ NH_3}[/tex]
Flip the ratio so the units of moles of hydrogen cancel.
[tex]0.45 \ mol \ H_2 *\frac{2 \ mol \ NH_3 }{3 \ mol \ H_2}[/tex]
[tex]0.45 *\frac{2 \ mol \ NH_3 }{3}[/tex]
[tex]\frac {0.45 *2 \ }{3} mol \ NH_3[/tex]
[tex]\frac {0.9 \ }{3} mol \ NH_3[/tex]
[tex]0.3 \ mol \ NH_3[/tex]
0.3 moles of ammonia are produced when 0.45 moles of hydrogen gas react with nitrogen gas.
Help.
Work needs to be shown
show equations and how you did it
Answer:
436.8 mmHg.
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 0.93 atm
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Next, we shall convert the total pressure to mmHg . This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
0.93 atm = 0.93 × 760 mmHg / 1 atm
0.93 atm = 706.8 mmHg
Finally, we shall determine the pressure of the O₂. This can be obtained as follow:
Total pressure (Pₜ) = 706.8 mmHg
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Pₜ = Pₙ₂ + Pₒ₂
706.8 = 270 + Pₒ₂
Collect like terms
706.8 – 270 = Pₒ₂
436.8 = Pₒ₂
Pₒ₂ = 436.8 mmHg
Thus, the pressure of O₂ is 436.8 mmHg
How many atoms of carbon are in 79.7 moles of carbon?
Answer:
[tex]4.8 x 10^{25\\}[/tex] atoms
Explanation:
Use the avogadro number
79.7 moles C x [tex]\frac{6.022 x 10^{23} }{ 1 mole C}[/tex] = [tex]4.8 x 10^{25\\}[/tex] atoms
Chemical Reactions:Question 3
The graph shows the energy change that occurs during a chemical reaction.
Graph 1
Energy
Reaction Progress
What conclusion can be reached based upon the graph?
Select one
The energy of the reactants is less than the energy of the products,
The energy of the products and the energy of the reactants are equal.
The energy of the products is less than the energy of the reactants
Energy was neither absorbed not released during this reaction
Answer:
because of how big it is
Explanation:
frgftvtv
The graphs shows the energy change of an exothermic reaction. Hence, the energy of products is less than the energy of reactants. Thus, option c is correct.
What is an exothermic reaction?The reaction in which heat energy is evolved to the surroundings is called an exothermic reaction. The reaction where, the heat energy is absorbed by the system is called endothermic reaction.
An energy diagram is used to describe the energy change in a reaction and the energy difference between reactants and products. In an endothermic reaction, the reactants are absorbing sufficient energy and thus easily overcome the barrier potential.
In exothermic reactions, products are absorbing energy and overcome the barrier potential. Therefore, in exothermic reactions, the potential energy of products is less than that of reactants as shown in the diagram.
Find more on energy diagram:
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The density of a 25.0% HCl solution (by mass) is 1.05 g/mL, what is the molality of the solution?
(MW HCI: 36.46g/mol, H2O: 18.015g/mol)
a. 9.60 m
b. 6.86 m
c. 7.20 m
d. 9.14 m
e. None of the above
Answer:
[HCl] = 14.7M in HCl
Explanation:
Definition of Molarity (M) = moles solute / Liters of Solution
Given 25.0% HCl (aq) => 25g HCl/100g Solution => ? moles HCl/Liter Solution
Convert 25g HCl to moles = moles solute
moles HCl => moles HCl = 25g HCl / 18.015g HCl/mole HCl = 1.387732 mole HCl = 1.4 moles HCl (2sig.figs.)
Determine Liters of Solution as follows:
Given 25% HCl Solution => 25g HCl/100 g Solution
100 g Solution = (100 g solution) / (1.05 g Solution/ml Solution )
= 95.2381 ml Solution x 1 Liter Solution/1000 ml Solution
= 0.0952 Liters Solution
Apply above mole and volume data to definition of mole.
∴Molarity = moles solute / Liters solution
= 1.4 moles solute (HCl)/0.0952 L solution
= 14.7 Molar in HCl(aq)
an erlenmeyer flask contains 15.00mL of 0.030 M HCI before titration. 5.00 mL of 0.050 of M NaOH is added to the HCI in the flask during titration. What is the mole ratio of acid (HCI) to base (NaOH) in the balanced neutralization equation?
0.05 to 0.03
1:1
1:2
which expression. gives the actual moles of base added?
0.050x5.00
0.030x0.015
0.050x0.005
How many moles of H+ will be present following neautralization?
0.25
0.00025
0.025
Answer:
1.1
0.050*0.005
0.00025
Explanation:
What is the pH when the hydrogen ion concentration is 1 x 10-3 M?
O a. 3.3
O b. 4
O c. 2.7
O d. 2
O e. 3
Answer:
e. 3
Explanation:
In order to solve this problem we need to keep in mind the definition of pH:
pH = -log[H⁺]As stated by the problem, the hydrogen ion concentration, [H⁺], is 1x10⁻³ M.
As all required information is available, we now can calculate the pH:
pH = -log(1x10⁻³ M)pH = 3The correct option is thus e.
iaeurphgqihrgiqerhg;iadg;iwepi
Answer:
hkdhmfewavs,nxzjrgjngrnjm
Explanation:
Answer:h hed chd dechgde chsxqwertyuioplkjhgfdsaazxcvbnm
Explanation:
A mixture of 14.0 grams of H2, 84.0 grams of N2, and 64.0 grams of O2 are placed in a flask. The partial pressure of the O2 is 78.00 torr. What is the total pressure in the flask
Answer:
[tex]P_{tot}=465.27torr[/tex]
Explanation:
Hello there!
In this case, according to the given information, it will be possible for us to use the Dalton's law, in order to solve this problem. However, we first need to calculate the mole fraction of oxygen by firstly calculating the moles of each gas:
[tex]n_{H_2}=\frac{14.0g}{2.02g/mol} =6.93mol\\\\n_{N_2}=\frac{84.0g}{28.02g/mol}=3.00mol\\\\n_{O_2}=\frac{64.0}{16.00g/mol} =2.00mol[/tex]
Next, we calculate such mole fraction as follows:
[tex]x_{O_2}=\frac{2}{6.93+3+2} =0.168[/tex]
Then, given the following equation:
[tex]P_{O_2}=P_{tot}*x_{O_2}[/tex]
So we solve for the total pressure as follows:
[tex]P_{tot}=\frac{P_{O_2}}{x_{O_2}} \\\\P_{tot}=\frac{78.00torr}{0.168} \\\\P_{tot}=465.27torr[/tex]
Regards!
Consider the unbalanced equation for the neutralization of acetic acid:
αHC2H3O2(aq)+βBa(OH)2(aq) →γH2O(l)+δBa(C2H3O2)2(aq)
1- Balance the equation.
Give your answer as an ordered set of numbers α, β, γ, ... Use the least possible integers for the coefficients.
2-Determine how many moles of Ba(OH)2 are required to completely neutralize 0.442 mole of HC2H3O2.
Answer:
Now
This looks hard to balance because the elements are highly distributed
The step to take is
Write out the Number of atoms of each element on the reactant side and those on the product side
Balance the (CH3COO)Ba on the product side by putting 2 I'm front of acetic acid on tbe reactant side.
Then balance Oxygen and Hydrogen by putting 2 in front of H2O
The balance reaction will be
2HC2H3O2 + Ba(OH)2 ==2H2O + Ba(C2H3O2)
Now for the last part
How many Moles of Ba(OH)2 that'll neutralize 0.442moles of Acetic acid
From the balanced equation
2 moles of acetic acid(HC2H3O2) reacts with 1mole of Ba(OH)2
Therefore
The ratio is 2:1
So 0.442 moles of acetic acid will react with 0.442/2 moles of Ba(OH)2
= 0.221moles of Ba(OH)2.
Explanation
2 HCl + Na2SO4 > 2 NaCl + H2SO4
If you start with 20 grams of hydrochloric acid, how many grams of sulfuric acid will be produced?
Answer:
15
Explanation:
Fill the missing blank
i’m generally confused about this so if anyone could help me it would mean a lot!!!!
Answer:
The answers to your questions are given below.
Explanation:
1. The symbol of Zinc is Zn
2. Determination of the proton number
Atomic number is simply defined as the number of protons in the nucleus of an atom. Mathematically, it is expressed:
Atomic number = proton number
Atomic number = 30
Therefore,
Proton number = 30
3. Determination of the neutron number
Mass Number = 65
Proton number = 30
Neutron number =?
Mass number = Proton + Neutron
65 = 30 + Neutron
Collect like terms
65 – 30 = Neutron
35 = Neutron
Thus,
Neutron number = 35
4. Determination of the electron number
Since the element is in it's ground state (i.e it has no charge), thus, the number of protons of the element is the same as number of electrons i.e
Electron number = proton number
Proton number = 30
Thus,
Electron number = 30
A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and
17 neutrons. Which is symbol of this radionuclide?
Answer: ³²P
Explanation:
The radionuclide in question is known as Phosphorus-32. It is an isotope of Phosphorus that is radioactive and has one more neutron than the normal phosphorus does.
Phosphorus does not exist in nature and is created artificially by bombarding the normal stable phosphorus with neutrons. Due to its radioactive nature, it has proven to be useful in the medical industry where it has been used to detect eye tumors as well as in treating some diseases.