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Worksheet: Percentage Yield

Q1:

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

Q2:

Sodium nitrate was dissolved in water at 8 0 C to produce a saturated solution. The solution was filtered to remove undissolved solid, then cooled to 0 C to precipitate the sodium nitrate. The solubilities of sodium nitrate at 80 and 0 C are 148 g/L and 73 g/L, respectively. Calculate the percentage yield for this recrystallization method.

Q3:

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 t h e - a c t u a l y i e l d = × 1 0 0 %
  • B 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 %
  • C 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 - =
  • 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 t h e o r e t i c 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 t h e - a c t u a l y i e l d =

Q4:

Reaction of 1.274 g of aqueous copper sulfate with excess zinc metal produced 0.392 g of copper metal according to the equation:

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

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?