Unit 3 Quiz--Moles, Mass, Molecules, and Gas Volumes in Chemical Reactions-- Thurston High Chemistry


Multiple Choice (Choose the best answer.)

Use the balanced reaction below to answer questions 1 - 10:

CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) + 810 KJ

  1. In the reaction above, 1 mole of CH4 would require how many moles of O2 to react completely?

    1/2 mol of O2

    2/3 mol of O2

    1 mol of O2

    1 1/2 mol of O2

    2 mol of O2

  2. In the reaction above, 3 moles of CH4 could produce how many moles of H2O?

    1/2 mol H2O

    2 mol H2O

    3 mol H2O

    5 mol H2O

    6 mol H2O

  3. If you wanted to change moles of O2 to liters of CO2 at STP, you should perform the following steps:

    moles O2 liters O2 liters CO2

    liters O2 moles CO2 liters CO2

    moles O2 liters CO2 moles CO2

    moles CO2 moles O2 liters O2

    moles O2 moles CO2 liters CO2

  4. In the reaction above, 3.5 moles of O2 would require how many grams of CH4 to react completely?

    0.0089 g CH4

    0.44 g CH4

    9.1 g CH4

    28 g CH4

    112 g CH4

  5. In the reaction above, the production 5.0 x 10 24 molecules of H2O would result in how many moles of CO2?

    0.060 mol CO2

    0.24 mol CO2

    4.2 mol CO2

    16.6 mol CO2

    1.5 x 10 48 mol CO2

  6. In the reaction above, 17 L of CO2 at STP could produce how many moles of water?

    0.0053 mol water

    0.647 mol water

    0.77 mol water

    1.5 mol water

    27 mol water

  7. If you wanted to change liters of CH4 at STP to molecules of H2O, you should perform the following steps:

    moles CH4 liters CH4 moles H2O molecules of H2O

    liters CH4 moles CH4 moles H2O molecules of H2O

    liters CH4 moles CH4 molecules H2O moles of H2O

    liters CH4 moles H2O moles CH4 molecules of H2O

    molecules of H2O moles H2O moles CH4 liters CH4

  8. In the reaction above, 5.0 g of O2 could produce how many grams of H2O?

    2.8 g H2O

    5.6 g H2O

    8.9 g H2O

    1500 g H2O

    2900 g H2O

  9. In the reaction above, 2.0 g of CH4 could produce how many molecules of CO2?

    2.8 molecules of CO2

    5.5 molecules of CO2

    3.8 x 10 22 molecules of CO2

    7.5 x 10 22 molecules of CO2

    1.5 x 10 23 molecules of CO2

  10. Combustion of 12 g of CH4 would produce how much energy?

    6.4 x 10 -6 KJ

    4.2 KJ

    610 KJ

    1100 KJ

    160000 KJ

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