Quiz 1: Quantitative Chemistry

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Questions: 10 | Attempts: 367

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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.
You have 20 minutes to attempt all the questions. You may use the Periodic Table from the back of your book.

• 1.

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

• A.

5

• B.

9

• C.
• D.
D.
Explanation
1 mol of  = 9 mol of O atoms
Number of O atoms =

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• 2.

Which compound has the empirical formula with the largest mass?

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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• 3.

• A.

2

• B.

3

• C.

4

• D.

5

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 %

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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• 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

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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• 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?

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

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

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

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

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
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• Nov 18, 2011
Quiz Created by
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