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 (C)</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 (B)</p> Signup and view all the answers

What is the definition of actual yield?

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

What does percent yield indicate about a reaction?

<p>The efficiency of the reaction (A)</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 (C)</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 (A)</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 % (D)</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 (D)</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 (B)</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 (D)</p> Signup and view all the answers

What does the subscript in a chemical equation represent?

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

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