Atom economy

Last updated: 02/04/2020

WJEC A-Level Chemistry Unit 1.3 – Chemical calculations Atom economy

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Question 1 of 20

1. Question
What is the equation for atom economy?
- molecular formula of desired product / sum of molecular masses of all products
- theoretical amount of product / actual amount of product
- sum of molecular masses of all products / molecular formula of desired products
- actual amount of product / theoretical amount of product
Question 2 of 20

2. Question
What is the atom economy of sodium chloride in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

Na $_2$ SO $_4$ (aq) + SrCl $_2$ (aq) -> 2NaCl(aq) + SrSO $_4$ (s)
- 38.9%
- 12.8%
- 58.1%
- 71.3%
Question 3 of 20

3. Question
What is the atom economy of sodium carbonate in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

2NaHCO $_3$ (s) -> Na $_2$ CO $_3$ (s) + CO $_2$ (g) + H $_2$ O(l)
- 63.1%
- 93.6%
- 99.6%
- 32.6%
Question 4 of 20

4. Question
What is the atom economy of magnesium chloride in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

2HCl(aq) + Mg(OH) $_2$ (aq) -> 2H_2O(l) + MgCl $_2$ (aq)
- 72.6%
- 70.5%
- 86.0%
- 55.6%
Question 5 of 20

5. Question
What is the atom economy of potassium chloride in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

HCl(aq) + KOH(aq) -> H $_2$ O(l) + KCl(aq)
- 80.6%
- 61.3%
- 9.5%
- 39.2%
Question 6 of 20

6. Question
What is the atom economy of iron chloride in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

3HCl(aq) + Fe(OH) $_3$ (s) -> 3H $_2$ O(l) + FeCl $_3$ (aq)
- 75.0%
- 95.7%
- 13.7%
- 88.2%
Question 7 of 20

7. Question
What is the atom economy of ammonia in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

Ba $_3$ N $_2$ (s) + 6H $_2$ O(l) -> 3Ba(OH) $_2$ (aq) + 2NH $_3$ (g)
- 6.2%
- 35.8%
- 16.8%
- 72.7%
Question 8 of 20

8. Question
What is the atom economy of hydrochloric acid in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

PCl $_5$ (s) + 4H $_2$ O(l) -> H $_3$ PO $_4$ (l) + 5HCl(l)
- 65.1%
- 82.2%
- 57.4%
- 18.2%
Question 9 of 20

9. Question
What is the atom economy of tin in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

SnO $_2$ (s) + 2H $_2$ (g) -> Sn(s) + 2H $_2$ O(l)
- 76.7%
- 60.7%
- 16.3%
- 88.2%
Question 10 of 20

10. Question
What is the atom economy of sodium carbonate in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

2NaHCO $_3$ (s) -> Na $_2$ CO $_3$ (s) + CO $_2$ (g) + H $_2$ O(l)
- 63.1%
- 70.7%
- 73.8%
- 24.5%
Question 11 of 20

11. Question
What is the atom economy of sodium fluoride in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

2NaCl(aq) + F $_2$ (g) -> 2NaF(s) + Cl $_2$ (g)
- 54.8%
- 60.4%
- 97.5%
- 10.7%
Question 12 of 20

12. Question
What is the atom economy of fluorine in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

CaF $_2$ (s) + Br $_2$ (l) -> CaBr $_2$ (s) + F $_2$ (g)
- 16.0%
- 77.9%
- 5.7%
- 24.6%
Question 13 of 20

13. Question
What is the atom economy of copper nitrate in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

CuCl $_2$ (aq) + 2AgNO $_3$ (aq) -> Cu(NO $_3$ ) $_2$ (aq) + 2AgCl(s)
- 39.5%
- 45.3%
- 100%
- 88.5%
Question 14 of 20

14. Question
What is the atom economy of hydrogen in the following reaction? Leave your answer to one decimal place and use the following equation to help you.

C $_3$ H $_8$ (g) -> C $_3$ H $_4$ (g) + 2H $_2$ (g)
- 9.1%
- 38.6%
- 7.6%
- 40.5%
Question 15 of 20

15. Question
What is the atom economy of water in the following reaction?

2H $_2$ (g) + O $_2$ (g) -> 2H $_2$ O(l)
- 100%
- 93%
- 67%
- 37%
Question 16 of 20

16. Question
What is the atom economy of water in the following reaction?

CH $_4$ (g) + 2O $_2$ (g) -> CO $_2$ (g) + 2H $_2$ O(l)
- 45%
- 22%
- 75%
- 30%
Question 17 of 20

17. Question
What is the atom economy of potassium bromide in the following reaction?

2K(s) + Br $_2$ (l) -> 2KBr(s)
- 100%
- 45%
- 78%
- 23%
Question 18 of 20

18. Question
What is the atom economy of sodium chloride in the following reaction?

2Na(s) + Cl $_2$ (g) -> 2NaCl(s)
- 100%
- 90%
- 23%
- 72%
Question 19 of 20

19. Question
What is the atom economy of ethanoic acid in the following reaction?

CH $_3$ CH $_2$ OH(l) + O $_2$ (g) -> CH $_3$ COOH(aq) + H $_2$ O(l)
- 77%
- 65%
- 31%
- 33%
Question 20 of 20

20. Question
What is the atom economy of iron oxide in the following reaction?

4Fe(s) + 3O $_2$ (aq) -> 2Fe $_2$ O $_3$ (s)
- 100%
- 87%
- 40%
- 22%