Yield the amount of product Theoretical yield the

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Yield: the amount of product Theoretical yield: the amount of product we expect, based

Yield: the amount of product Theoretical yield: the amount of product we expect, based on stoichiometric calculations Actual yield: amount of product from a procedure or experiment (this is given in the question) Percent yield: actual yield x 100% theoretical yield

Why does the actual yield in a chemical reaction often fall short of theoretical

Why does the actual yield in a chemical reaction often fall short of theoretical yield? • Not all product is recovered (e. g. spattering) • Reactant impurities (e. g. weigh out 100 g of chemical which has 20 g of junk) • A side reaction occurs (e. g. Mg. O vs. Mg 3 N 2) • The reaction does not go to completion

Procedure Step 1: write the balanced chemical equation Step 2: determine actual and theoretical

Procedure Step 1: write the balanced chemical equation Step 2: determine actual and theoretical yield. Actual is given, theoretical is calculated: Step 3: Calculate % yield

Q 1 - What is the % yield of H 2 O if 138

Q 1 - What is the % yield of H 2 O if 138 g H 2 O is produced from 16 g H 2 and excess O 2?

Q 2 - What is the % yield of NH 3 if 40. 5

Q 2 - What is the % yield of NH 3 if 40. 5 g NH 3 is produced from 20. 0 mol H 2 and excess N 2?

Q 3 When 5. 00 g of KCl. O 3 is heated it decomposes

Q 3 When 5. 00 g of KCl. O 3 is heated it decomposes according to the equation: 2 KCl. O 3 2 KCl + 3 O 2 a) Calculate theoretical yield of oxygen.

b) Give the % yield if 1. 78 g of O 2 is produced.

b) Give the % yield if 1. 78 g of O 2 is produced. c) How much O 2 would be produced if the percentage yield was 78. 5%?

Q 4 What is the % yield of H 2 O if 58 g

Q 4 What is the % yield of H 2 O if 58 g H 2 O are produced by combining 60 g O 2 and 7. 0 g H 2?

More Percent Yield Questions 1. The electrolysis of water forms H 2 and O

More Percent Yield Questions 1. The electrolysis of water forms H 2 and O 2. 2 H 2 O 2 H 2 + O 2 What is the % yield of O 2 if 12. 3 g of O 2 is produced from the decomposition of 14. 0 g H 2 O? 2. What is the % yield of iron (II) sulphide if 3. 00 moles of Fe reacts with excess sulfur (S 8) to produce 220 grams of ferrous sulphide? Assume 2+ ion for iron.

More Percent Yield Questions 3. Iron pyrites (Fe. S 2) reacts with oxygen according

More Percent Yield Questions 3. Iron pyrites (Fe. S 2) reacts with oxygen according to the following equation: 4 Fe. S 2 + 11 O 2 2 Fe 2 O 3 + 8 SO 2 If 300. g of iron pyrites is burned in 200. g of O 2, 143 grams of ferric oxide is produced. What is the percent yield of ferric oxide?

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