Quiz 1: Quantitative Chemistry

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| By WlHKIED

WlHKIED

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Quizzes Created: 2 | Total Attempts: 1,179

Questions: 10 | Attempts: 365 | Updated: Mar 22, 2023

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This quiz consists of 10 questions.
Each question offers 4 suggested answers. Choose the answer you consider to be the best.
The maximum mark for this quiz is 10.
Answer ALL the questions.
You have 20 minutes to attempt all the questions. You may use the Periodic Table from the back of your book.

Questions and Answers

1.

What is the number of oxygen atoms in one mole of ?
- A.
  
  5
- B.
  
  9
- C.
- D.
Correct Answer
D.

Explanation
1 mol of = 9 mol of O atoms
Number of O atoms =

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1
1
2.

Which compound has the empirical formula with the largest mass?
- A.
- B.
- C.
- D.
Correct Answer
A.

Explanation
Empirical formula of
Empirical formula of
Empirical formula of
Empirical formula of
Hence the empirical formula with the largest mass is

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1
0
3.

When the equation below is balanced for 1 mol of , what is the coefficient for ?
- A.
  
  2
- B.
  
  3
- C.
  
  4
- D.
  
  5
Correct Answer
C. 4
4.

Calcium carbonate decomposes on heating as shown below. When 50 g of calcium carbonate are decomposed, 7 g of calcium oxide are formed. What is the percentage yield of calcium oxide?
- A.
  
  7 %
- B.
  
  25 %
- C.
  
  50 %
- D.
  
  75 %
Correct Answer
B. 25 %

Explanation
Amount of
Stoichiometric ratio of is 1 : 1
Amount of CaO = Amount of = 0.50 mol

Mass of CaO = 0.50 x 56 = 28 g
% yield = 7 g/28 g x 100% = 25%

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4
0
5.

5 of carbon monoxide, CO(g), and 2 of oxygen, (g), at the same temperature and pressure are mixed together. Assuming complete reaction according to the equation given, what is the maximum volume of carbon dioxide, (g), in , that can be formed?
- A.
  
  3
- B.
  
  4
- C.
  
  5
- D.
  
  7
Correct Answer
B. 4

Explanation
Apply the Avogadro's law: V proportional to n
Stoichiometric ratio of  is 2 : 2 (or 1 : 1)
Expected volume of  produced from CO = 5
Stoichiometric ratio of  is 1 : 2
Expected volume of  produced from  = 2 x 2 = 4
SInce  gives smaller volume of  produced, therefore  is limiting reactant and the maximum volume of  produced is 4

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1
0
6.

A gas sample occupies a volume at a pressure and a Kelvin temperature . What would be the temperature of the gas, , if both its pressure and volume are doubled?
- A.
- B.
- C.
- D.
Correct Answer
D.

Explanation
Applying the equation
Pressure double =>
Volume double =>

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7.

A blast furnace contains 1600 kg of iron(III) oxide ( = 160) and 144 kg of carbon ( = 12). Assuming that they react according to the following equation: what is the limiting reagent and the maximum theoretical yield of iron?
- A.
  
  Iron(III) oxide; 560 kg
- B.
  
  Iron(III) oxide; 1120 kg
- C.
  
  Carbon; 224 kg
- D.
  
  Carbon 448 kg
Correct Answer
D. Carbon 448 kg

Explanation
Assume the mass is given in grams
Stoichiometric ratio of  is 1 : 2
Amount of  = 1600/160 = 10 mol
Expected amount of Fe formed from  = 2 x 10 = 20 mol
Stoichiometric ratio of C : Fe is 3 : 2
Amount of C = 144/12 = 12 mol
Expected amount of Fe fromed from C = 12 x (2/3) = 8 mol
Since carbon gives the least amount of Fe, therefore carbon is the limiting reactant

Maximum yield of iron = 8 x 56 = 448 kg

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8.

Which sample of nitrogen gas, , contains the greatest number of nitrogen molecules?
- A.
  
  1.4 g
- B.
  
  1.4 of at Pa and 273 K
- C.
  
  molecules
- D.
  
  1.4 mol
Correct Answer
D. 1.4 mol

Explanation
Number of molecules is proportional to amount
Amount of  in choice 1 = 1.4/28 = 1/20 mol
Amount of  in choice 2 = 1.4/22.4 = 14/224 = 1/16 mol
Amount of  in choice 3 =
Amount of  in choice 4 = 1.4 mol
Hence choice 4 has the greatest amount of  and therefore the greatest number of  molecules.

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9.

What will be the concentration of sulfate ions in when 0.20 mol is dissolved in water to give 100 of aqueous solution?
- A.
  
  0.2
- B.
  
  1.0
- C.
  
  2.0
- D.
  
  4.0
Correct Answer
D. 4.0

Explanation
1 mol of  contains 2 mol of  ions
0.20 mol of  = 0.40 mol of  ions
Volume = 100  = 0.1
Concentration of  = 0.40/0.1 = 4.0

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10.

What volume, in , of 0.200 HCl(aq) is required to neutralize 25.0 of 0.200 (aq)?
- A.
  
  12.5
- B.
  
  25.0
- C.
  
  50.0
- D.
  
  75.0
Correct Answer
C. 50.0

Explanation
Assume the given volume is interms of

Amount of = 25.0 x 0.200 = 5.00 mol
Stoichiometric ratio of is 2 : 1
Amount of HCl = 5.00 x 2 = 10.0 mol
Concentration of HCl = 0.200
Volume of HCl required = 10.0/0.200 = 50.0

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Current Version
Mar 22, 2023

Quiz Edited by
ProProfs Editorial Team
Nov 18, 2011

Quiz Created by
WlHKIED

Quiz 1: Quantitative Chemistry

What is the number of oxygen atoms in one mole of ?

Which compound has the empirical formula with the largest mass?

When the equation below is balanced for 1 mol of , what is the coefficient for ?

Calcium carbonate decomposes on heating as shown below. When 50 g of calcium carbonate are decomposed, 7 g of calcium oxide are formed. What is the percentage yield of calcium oxide?

5 of carbon monoxide, CO(g), and 2 of oxygen, (g), at the same temperature and pressure are mixed together. Assuming complete reaction according to the equation given, what is the maximum volume of carbon dioxide, (g), in , that can be formed?

A gas sample occupies a volume at a pressure and a Kelvin temperature . What would be the temperature of the gas, , if both its pressure and volume are doubled?

A blast furnace contains 1600 kg of iron(III) oxide ( = 160) and 144 kg of carbon ( = 12). Assuming that they react according to the following equation: what is the limiting reagent and the maximum theoretical yield of iron?

Which sample of nitrogen gas, , contains the greatest number of nitrogen molecules?

What will be the concentration of sulfate ions in when 0.20 mol is dissolved in water to give 100 of aqueous solution?

What volume, in , of 0.200 HCl(aq) is required to neutralize 25.0 of 0.200 (aq)?