Percentage yields
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Question 1 of 18
1. Question
What is the equation to work out percentage yield?

Question 2 of 18
2. Question
What is used to measure percentage yield?

Question 3 of 18
3. Question
What does percentage yield measure?

Question 4 of 18
4. Question
During a photosynthesis reaction, 5.25 dm^3 of carbon dioxide is used with an excess of water, 3.21 grams of glucose is obtained. What is the percentage yield of glucose? Leave your answer to two decimal places and use the following equation to help you.
CO_2(g) + 6H_2O(l) – > 6O_2(g) + C_6H_{12}O_6(aq)

Question 5 of 18
5. Question
During the electrolysis of water, 250 cm^3 of hydrogen is used with an excess of oxygen. 0.092 grams of water is obtained. What is the percentage yield of water? Leave your answer to one decimal place and use the following equation to help you.
2H_2(g) + O_2(g) – > 2H_2O(l)

Question 6 of 18
6. Question
0.500 dm^3 of ethanol is oxidised with an excess of oxygen. 1.250 grams of acetic acid is obtained. What is the percentage yield of acetic acid? Leave your answer to three significant figures and use the following equation to help you.
CH_3CH_2OH(l) + O_2(g) – > CH_3COOH(aq) + H_2O(l)

Question 7 of 18
7. Question
150 cm^3 of hydrochloric acid is reacted with an excess of zinc. 0.450 grams of zinc chloride is obtained. What is the percentage yield of zinc chloride? Leave your answer to two decimal places and use the following equation to help you.
Zn + 2HCl – > H_2 + ZnCl_2

Question 8 of 18
8. Question
164 cm^3 of copper is reacted with an excess of silver nitrate. 0.61 grams of copper nitrate is obtained. What is the percentage yield of copper nitrate? Leave your answer to one decimal place and use the following equation to help you.
Cu + 2AgNO_3 > 2Ag + Cu(NO_3)_2

Question 9 of 18
9. Question
5.3 dm^3 of sodium hydroxide is reacted with an excess of hydrochloric acid. 2.205 grams of sodium chloride is obtained. What is the percentage yield of sodium chloride? Leave your answer to two significant figures and use the following equation to help you.
HCl + NaOH – > NaCl + H_2O

Question 10 of 18
10. Question
500 cm^3 of barium chloride is reacted with an excess of silver nitrate. 0.915 grams of silver chloride is obtained. What is the percentage yield of silver chloride? Leave your answer to two decimal places and use the following equation to help you.
BaCl_2 + 2AgNO_3 – > 2AgCl + Ba(NO_3)_2

Question 11 of 18
11. 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

Question 12 of 18
12. 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(s) + 2H_2O(l) > 2NaOH(aq) + H_2(g)

Question 13 of 18
13. Question
10.5 dm^3 grams of hydrogen is reacted with an excess of silver nitrate. 67.3 grams of silver is obtained. What is the percentage yield of silver? Leave your answer to three significant figures and use the following equation to help you.
H_2 + 2AgNO_3 – > 2Ag + 2HNO_3

Question 14 of 18
14. Question
5.62 dm^3 of magnesium hydroxide is reacted with an excess of nitric acid. 2.4 dm^3 of magnesium nitrate is obtained. What is the percentage yield of magnesium nitrate? Leave your answer to one decimal place and use the following equation to help you.
Mg(OH)_2 + 2HNO_3 – > Mg(NO_3)_2 + 2H_2O

Question 15 of 18
15. Question
50 grams of aluminium is reacted with an excess of oxygen. 10.5 dm^3 of aluminium oxide is obtained. What is the percentage yield of aluminium oxide? Leave your answer to one decimal place and use the following equation to help you.
4Al + 3O_2[/latex – > 2Al[latex]_2O_3

Question 16 of 18
16. Question
34.50 grams of ethanoic acid is reacted with an excess of ethanol. 12,000 cm^3 of ethyl ethanoate is obtained. What is the percentage yield of ethyl ethanoate? Leave your answer to two decimal places and use the following equation to help you.
CH_3COOH + C_2H_5OH  > CH_3COOC_2H_5 + H_2O

Question 17 of 18
17. 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 and use the following equation to help you.
HCl + C_2H_4  > C_2H_5Cl

Question 18 of 18
18. Question
0.56 grams of salicylic acid is reacted with 0.39 grams of ethanoyl chloride. 0.02 grams of aspirin is obtained. What is the percentage yield of aspirin? Leave your answer to one decimal place and use the following equation to help you.
C_7H_6O_3(aq) + C_2H_3OCl(aq) > C_9H_8O_4(aq) + HCl(aq)