Stoichiometry Trivia Test: MCQ Quiz!

9 Questions | Total Attempts: 336

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Stoichiometry Trivia Test: MCQ Quiz!

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Questions and Answers
  • 1. 
    Ammonia, , and copper (II) oxide react to form solid copper, water and nitrogen gas. What are the coefficients for the balanced chemical equations.
    • A. 

      2,2,2,1,1

    • B. 

      1,2,1,2,1

    • C. 

      2,3,3,3,1

  • 2. 
    If 40g of ammonia reacts with 80.0g copper (II) oxide, determine the limiting reactant. Use nitrogen gas as your unknown.
    • A. 

      Ammonia

    • B. 

      Copper(II) oxide

  • 3. 
    Determine the mass of nitrogen gas produced in the reaction.
    • A. 

      9.4 g

    • B. 

      14.0g

    • C. 

      28.0 g

  • 4. 
    Which reactant is the excess reactant?
    • A. 

      Ammonia

    • B. 

      Copper(II) oxide

  • 5. 
    How much of the excess reactant remains after the reaction? **Ammonia is the excess reactant, meaning it will not be completely used up in a reaction. In other words, you will not be using all 40g of ammonia given. In order to find out how much is left over after the reaction, do a mass-mass problem. 80g CuO is the given and grams of ammonia is the unknown. This answer is how much ammonia is used up. Now, figure out how much is leftover!
    • A. 

      19.8 g

    • B. 

      32.4 g

    • C. 

      28.6 g

  • 6. 
    When copper(II) oxide is heated with hydrogen gas, water and copper metal is produced. What mass of copper can be obtained if 32.0g of copper(II) oxide is used?
    • A. 

      24.3g

    • B. 

      25.5g

    • C. 

      27.6g

  • 7. 
    Nitrogen monoxide reacts with oxygen gas to produce nitrogen dioxide. What are the coefficients that balance the equation?
    • A. 

      2,1,2

    • B. 

      1,2,1

    • C. 

      2,1,1

  • 8. 
    What is the theoretical yield of hydrogen gas if 36.0 g of water decomposes to produce hydrogen gas and oxygen gas?
    • A. 

      2.02 g H2

    • B. 

      1.01 g H2

    • C. 

      4.04 g H2

  • 9. 
    What is the percent yield of hydrogen gas if 3.80g of hydrogen is collected in the lab?
    • A. 

      94%

    • B. 

      88%

    • C. 

      96%

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