Stoichiometry and Limiting Reagents Quiz
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Questions and Answers

What is the limiting reagent in the reaction Zn + 2 HCl $\rightarrow$ ZnCl2 + H2?

  • H2
  • ZnCl2
  • Zn (correct)
  • HCl
  • What is the theoretical yield of ZnCl2 when 0.100 mol of Zn reacts with excess HCl?

  • 0.050 mol (correct)
  • 0.200 mol
  • 0.100 mol
  • 0.025 mol
  • What is the percent yield if the actual yield of ZnCl2 is 0.045 mol?

  • 90% (correct)
  • 75%
  • 80%
  • 95%
  • If 0.100 mol of ZnCl2 is produced, how many moles of H2 are formed?

    <p>0.050 mol</p> Signup and view all the answers

    What is the definition of theoretical yield?

    <p>The amount of product expected based on the balanced equation</p> Signup and view all the answers

    What is the definition of actual yield?

    <p>The amount of product actually obtained in the lab</p> Signup and view all the answers

    What does percent yield indicate about a reaction?

    <p>The efficiency of the reaction</p> Signup and view all the answers

    In the equation $2Al + 3 CuSO4 ightarrow Al2(SO4)3 + 3 Cu$, what is the theoretical yield if 3.92 g of Al is reacted?

    <p>13.8 g Cu</p> Signup and view all the answers

    What is the actual yield in the given reaction if 6.78 g of copper is produced?

    <p>6.78 g Cu</p> Signup and view all the answers

    What is the percent yield in the given reaction if the theoretical yield is 13.8 g and the actual yield is 6.78 g?

    <p>49.1 %</p> Signup and view all the answers

    What is the general plan for stoichiometry calculations?

    <p>Mass reactant $ ightarrow$ Moles reactant $ ightarrow$ Moles product $ ightarrow$ Mass product</p> Signup and view all the answers

    In the decomposition reaction $NH4NO3 ightarrow N2O + 2 H2O$, if 454 g of NH4NO3 decomposes, how much N2O is formed?

    <p>5.68 mol N2O</p> Signup and view all the answers

    In the decomposition reaction $NH4NO3 ightarrow N2O + 2 H2O$, what is the theoretical yield of H2O if 454 g of NH4NO3 decomposes?

    <p>204 g H2O</p> Signup and view all the answers

    What does the subscript in a chemical equation represent?

    <p>A constant number that cannot be changed</p> Signup and view all the answers

    What can cause the actual yield to be less than the theoretical yield?

    <p>Impure reactants, competing side reactions</p> Signup and view all the answers

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