## GCSE Chemistry – Percentage and theoretical yield

**Learning Objectives **

-I can calculate theoretical and percentage yield

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- Question 1 of 8
##### 1. Question

What is the definition of the yield of a reaction?

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##### 2. Question

What is the definition of percentage yield?

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##### 3. Question

What is the definition of theoretical yield?

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##### 4. Question

What is the formula for percentage yield?

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##### 5. Question

0.0345 grams of hydrochloric acid is reacted with 0.05 grams of ethene. 0.0022 grams of ethyl chloride is obtained. What is the percentage yield of ethyl chloride? Leave your answer to one decimal place.

HCl(aq) + C_2H_4(l) -> C_2H_5Cl(l)

CorrectIncorrect - Question 6 of 8
##### 6. Question

0.56 grams of salicylic acid, C_7H_6O_3, is reacted with 0.39 grams of ethanoyl chloride, C_2H_3OCl. 0.02 grams of aspirin is obtained. What is the percentage yield of aspirin, C_9H_8O_4? Leave your answer to one decimal place and use the following equation to help you.

C_7H_6O_3 + C_2H_3OCl -> C_9H_8O_4 + HCl

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##### 7. Question

4.65 grams of sodium is reacted with an excess of water. 2.10 grams of sodium hydroxide is obtained. What is the percentage yield of sodium hydroxide? Leave your answer to two decimal places and use the following equation to help you.

2Na + 2H_2O -> 2NaOH + H_2

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##### 8. Question

5.4 grams of calcium carbonate is reacted with an excess of hydrochloric acid. 3.015 grams of calcium chloride is obtained. What is the percentage yield of calcium chloride? Leave your answer to one decimal place and use the following equation to help you.

CaCO_3 + 2HCl – > CaCl_2 + H_2CO_3

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