6. Chemical Reactions & Quantities

Percent Yield

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Percent Yield Example 1

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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)

Ammonia, NH₃, reacts with hypochlorite ion, OCl^–, to produce hydrazine, N₂H₄. How many grams of hydrazine are produced from 115.0 g NH₃ if the reaction has a 81.5% yield?

2 NH₃ + OCl^– → N₂H₄ + Cl^– + H₂O

The reduction of iron (III) oxide creates the following reaction:

Fe₂O₃ (s) + 3 H₂ (g) → 2 Fe (s) + 3 H₂O (g)

If the above reaction only went to 75% completion, how many moles of Fe₂O₃ were require to produce 0.850 moles of Fe?

The reaction of ethylene oxide with water to give ethylene glycol (automobile antifreeze) occurs in 96.0% actual yield. How many grams of ethylene glycol are formed by reaction of 35.0 g of ethylene oxide? (For ethylene oxide, MW = 44.0 amu; for ethylene glycol, MW = 62.0 amu.)

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Textbook Question

Consider the balanced chemical equation: A2 + 2B2 → 2AB2. A reaction is performed with the initial amounts of A2 and B2 shown in part (a). The amount of product obtained is shown in part (b). Calculate the percent yield. a.

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