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General A003: Mole calculations

  • Page ID
    63556
  • Quiz: Mole calculations involving gases. Note: This quiz uses litres (L) as the unit of volume; this can be treated as equivalent to the dm3used in some UK curricula. Where not otherwise stated presume volume measurements are at STP.

    The following questions are multiple choice; mark the answer which you think is the most appropriate. These questions are for self-testing only, and are not suitable for assignments or exams.

    1. When 12.0 g carbon burns completely to give carbon dioxide, how many grams of oxygen are consumed?

    A 8.0 g
    B 12.0 g
    C 16.0 g
    D 24.0 g
    E 32.0 g

    2. When 12.0 g carbon burns completely to give carbon dioxide, how many litres (at STP) of oxygen are consumed?

    A 11.2 L
    B 16.0 L
    C 22.4 L
    D 32.0 L
    E 44.8 L

    3. When 24.3 g magnesium burns completely to give magnesium oxide (MgO), how many litres (at STP) of oxygen are consumed?

    A 11.2 L
    B 16.0 L
    C 22.4 L
    D 24.3 L
    E 32.0 L

    4. Hydrogen reacts with chlorine according to the equation:

    H2(g) + Cl2(g) → 2 HCl(g)

    If 0.05 L of hydrogen gas reacts completely with chlorine gas, how much hydrogen chloride is produced (at STP)?

    A 0.025 L
    B 0.05 L
    C 0.10 L
    D 0.224 L
    E 0.448 L

    5. Propane is used in some rural areas as a domestic heating fuel. It burns in air according to the equation:

    C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)

    If 20 L propane burns completely in oxygen, what volume (at STP) of carbon dioxide will be produced?

    A 6.67 L
    B 20 L
    C 22.4 L
    D 60 L
    E 67.2 L

    6. What mass of H2O will be produced when 11.2 L butane (C4H10) is burnt in excess oxygen (at STP)?

    A 11.2 g
    B 18.0 g
    C 45.0 g
    D 90.0 g
    E 180 g

    7. A sample of benzene (C6H6) is burnt in excess oxygen, and produces 67.2 L carbon dioxide at STP. What was the mass of benzene in the sample?

    A 11.2 g
    B 39.0 g
    C 44.0 g
    D 78.0 g
    E 156 g

    8. A sample of 13.0 g ethyne (C2H2) is hydrogenated fully over a Pd catalyst to produce ethane (C2H6) in quantitative (100%) yield. What volume (at STP) of hydrogen is consumed in the reaction?

    A 11.2 L
    B 13.0 L
    C 22.4 L
    D 26.0 L
    E 39.0 L

    9. Sulfur dioxide (10.0 L at STP) is oxidized completely by oxygen in the presence of a vanadium pentoxide catalyst to produce sulfur trioxide. The equation for the reaction is: 2 SO2(g) + O2(g) → 2 SO3(g) After reaction, the SO3 is returned to STP. What is the total volume reduction that occurs over the course of the reaction?

    A 5.0 L
    B 10.0 L
    C 11.2 L
    D 12.4 L
    E 15.0 L

    10. A sample of 0.30 L fluorine (at STP) is reacted completely with sulfur to produce sulfur hexafluoride (SF6). What volume of SF6 is produced, after it is returned to STP?

    A 0.025 L
    B 0.05 L
    C 0.10 L
    D 0.30 L
    E 0.90 L

    Answers:

    1. E

    2. C

    3. A

    4. C

    5. D

    6. C

    7. B

    8. C

    9. A

    10. C