Table of contents

1. The Chemical World9m
- The Scientific Method
  9m
2. Measurement and Problem Solving2h 19m
3. Matter and Energy2h 15m
4. Atoms and Elements2h 33m
5. Molecules and Compounds1h 50m
6. Chemical Composition1h 23m
7. Chemical Reactions1h 43m
8. Quantities in Chemical Reactions1h 8m
9. Electrons in Atoms and the Periodic Table2h 32m
10. Chemical Bonding2h 10m
11 Gases2h 7m
12. Liquids, Solids, and Intermolecular Forces1h 11m
13. Solutions3h 1m
14. Acids and Bases2h 14m
15. Chemical Equilibrium1h 27m
16. Oxidation and Reduction1h 33m
17. Radioactivity and Nuclear Chemistry53m

8. Quantities in Chemical Reactions

Percent Yield

Introduction to Chemistry

8. Quantities in Chemical Reactions

Percent Yield

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Multiple Choice

What is the percent yield for a reaction in which 22.1 g Cu is isolated by reacting 45.5 g Zn with 70.1 g CuSO₄?
Zn (s) + CuSO₄ (aq) → Cu (s) + ZnSO₄ (aq)

63.1 %

90.7 %

79.2 %

67.1 %

50.0 %

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Verified step by step guidance

Identify the balanced chemical equation for the reaction: Zn (s) + CuSO4 (aq) → Cu (s) + ZnSO4 (aq). This equation shows that one mole of Zn reacts with one mole of CuSO4 to produce one mole of Cu.

Calculate the molar masses of the reactants and products. The molar mass of Zn is approximately 65.38 g/mol, CuSO4 is approximately 159.61 g/mol, and Cu is approximately 63.55 g/mol.

Determine the theoretical yield of Cu. First, calculate the moles of Zn and CuSO4 available: moles of Zn = 45.5 g / 65.38 g/mol, and moles of CuSO4 = 70.1 g / 159.61 g/mol. The limiting reactant will determine the theoretical yield.

Using the limiting reactant, calculate the theoretical yield of Cu in grams. The moles of the limiting reactant will be equal to the moles of Cu produced, as per the stoichiometry of the balanced equation.

Calculate the percent yield using the formula: Percent Yield = (Actual Yield / Theoretical Yield) * 100. The actual yield is given as 22.1 g of Cu. Substitute the actual yield and the calculated theoretical yield into the formula to find the percent yield.