Worksheet: Percentage Yield

In this worksheet, we will practice calculating the percentage yield of desired products based on the actual amount and the theoretical maximum.

Q1:

Sodium nitrate was dissolved in water at 80C to produce a saturated solution. The solution was filtered to remove undissolved solid and then cooled to 0C to precipitate the sodium nitrate. The solubilities of sodium nitrate at 80 and 0C are 148 g/L and 73 g/L respectively. Calculate the percentage yield for this recrystallization method.

Q2:

Reaction of 1.274 g of aqueous copper sulfate with excess zinc metal produced 0.392 g of copper metal according to the equation shown. CuSO()+Zn()Cu()+ZnSO()44aqssaq

Calculate to 2 significant figures the percentage yield of this reaction.

Q3:

A student treated 15 g of copper(II) oxide with excess hydrochloric acid and purified the copper(II) chloride product by recrystallization. The final mass of pure copper(II) chloride was 11 g. What was the percentage yield?

Q4:

What is the formula for calculating the percentage yield from the actual yield and the theoretical yield?

  • A P e r c e n t a g e y i e l d a c t u a l y i e l d t h e o r e t i c a l y i e l d =
  • B P e r c e n t a g e y i e l d t h e o r e t i c a l y i e l d a c t u a l y i e l d = × 1 0 0 %
  • C P e r c e n t a g e y i e l d t h e o r e t i c a l y i e l d a c t u a l y i e l d =
  • D P e r c e n t a g e y i e l d a c t u a l y i e l d = × 1 0 0 %
  • E P e r c e n t a g e y i e l d a c t u a l y i e l d t h e o r e t i c a l y i e l d = × 1 0 0 %

Q5:

A student is electroplating an electrode using copper sulfate solution. Based on the current measured during the experiment, the electrode should be coated with 12.2 g of copper. However, the electrode is only coated with 10.4 g of copper. What is the percentage yield of the electroplating process?

Q6:

In an attempt to make calcium oxide, a student heats 100.0 g of calcium carbonate and weighs the remaining solid material. The final mass is 62.3 g. What is the percentage yield of calcium oxide?

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