Quiz 1: Quantitative Chemistry

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  • 1/10 Questions
    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? - ProProfs

    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?

    • 7 %
    • 25 %
    • 50 %
    • 75 %
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Quiz 1: Quantitative Chemistry - Quiz
About This Quiz

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.

Quiz Preview

  • 2. 
    When the equation below is balanced for 1 mol of , what is the coefficient for ? - ProProfs

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

    • 2

    • 3

    • 4

    • 5

    Correct Answer
    A. 4
  • 3. 
    What is the number of oxygen atoms in one mole of ? - ProProfs

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

    Correct Answer
    A.
    Explanation
    1 mol of  = 9 mol of O atoms
    Number of O atoms = 

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  • 4. 
    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? - ProProfs

    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?

    • 3

    • 4

    • 5

    • 7

    Correct Answer
    A. 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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  • 5. 
    Which sample of nitrogen gas, , contains the greatest number of nitrogen molecules? - ProProfs

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

    • 1.4 g 

      Quiz 1: Quantitative Chemistry - Quiz

    • 1.4   of   at   Pa and 273 K

      Quiz 1: Quantitative Chemistry - Quiz

    •  molecules

      Quiz 1: Quantitative Chemistry - Quiz

    • 1.4 mol 

      Quiz 1: Quantitative Chemistry - Quiz
    Correct Answer
    A. 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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  • 6. 

    Which compound has the empirical formula with the largest mass?

    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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  • 7. 
    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? - ProProfs

    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?

    Correct Answer
    A.
    Explanation
    Applying the equation 
    Pressure double => 
    Volume double => 

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  • 8. 
    What volume, in , of 0.200  HCl(aq) is required to neutralize 25.0  of 0.200  (aq)? - ProProfs

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

    • 12.5

    • 25.0

    • 50.0

    • 75.0

    Correct Answer
    A. 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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  • 9. 
    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? - ProProfs

    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?

    • Iron(III) oxide; 560 kg

    • Iron(III) oxide; 1120 kg

    • Carbon; 224 kg

    • Carbon 448 kg

    Correct Answer
    A. 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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  • 10. 
    What will be the concentration of sulfate ions in  when 0.20 mol  is dissolved in water to give 100  of aqueous solution? - ProProfs

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

    • 0.2

    • 1.0

    • 2.0

    • 4.0

    Correct Answer
    A. 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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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 18, 2011
    Quiz Created by
    WlHKIED
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