Percent Yield Practice Problems

What is the equation to find percent yield?

Be + 2HCl → BeCl₂ + H₂

The theoretical yield of BeCl₂ was 10.7 grams. If the reaction actually yields 4.5 grams, what is the percent yield?

3H₂ + N₂ → 2NH₃

If 40 grams of H₂ produces a 4.5% yield, how many grams of NH₃ will be produced?

LiOH + KCl → LiCl + KOH

If 20 grams of LiOH is used, how many grams of LiCl can be produced? If the reaction actually produced 6 grams of LiCl, what is the percent yield?

• 35 grams LiCl

• 15%

• 39 grams LiCl

• 17%

NaHCO₃ → NaOH + CO₂

If 25 grams of NaHCO₃ are used in this reaction and 13 grams of NaOH are actually produced, what is the percent yield?

• 50%

• 64%

• 57%

• 67%

Mg + 2HNO₃ → Mg(NO₃)₂ + H₂

40 grams of Mg are used for this reaction. What is the percent yield if 1.7 grams of H₂ are actually produced?

• 48%

• 96%

• 52%

• 56%

2FePO₄ + 3Na₂SO₄ → Fe₂(SO₄)₃ + 2Na₃PO₄

What is the percent yield if 25 grams of FePO₄ are used and the reaction actually produces 18.5 grams?

2FePO₄ + 3Na₂SO₄ → Fe₂(SO₄)₃ + 2Na₃PO₄

If this reaction is completed with 15 grams of Na₂SO₄ and it results in a 65% yield, how many grams of Na₃PO₄ will be produced?

• 7.5 g Na₃PO₄

• 18 g Na₃PO₄

• 4 g Na₃PO₄

• 12 g Na₃PO₄