GCSE Chemistry – Empirical and molecular formula
Learning Objectives
-I can determine the empirical formula
-I can determine the molecular formula
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Question 1 of 20
1. Question
What is an empirical formula?
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Question 2 of 20
2. Question
For which type of compounds is the empirical formula used for?
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Question 3 of 20
3. Question
What should you do if when you find the empirical formula some of your values are not in whole numbers?
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Question 4 of 20
4. Question
A compound consists of C – 81.58%, H – 8.90% and N – 9.52%, work out the empirical formula.
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Question 5 of 20
5. Question
A compound consists of C – 60%, H – 4.48% and O – 35.53%, work out the empirical formula.
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Question 6 of 20
6. Question
A compound consists of C – 15.87%, H – 2.57%, N – 18.15% and O – 63.41%, work out the empirical formula.
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Question 7 of 20
7. Question
A compound consists of C – 75.52%, H – 6.63%, N – 8.38 and O – 9.57%, work out the empirical formula.
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Question 8 of 20
8. Question
A compound has the empirical formula C_2H_6, and a relative molecular mass of 90. What is its molecular formula?
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Question 9 of 20
9. Question
A compound has the empirical formula C_4H_8NO_2, and a relative molecular mass of 204. What is its molecular formula?
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Question 10 of 20
10. Question
A compound has the empirical formula C_2H_6Li, and a relative molecular mass of 184.5. What is its molecular formula?
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Question 11 of 20
11. Question
A compound has the empirical formula C_4H_{10} and a relative molecular mass of 232. What is its molecular formula?
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Question 12 of 20
12. Question
A compound has the empirical formula CH_3, and a relative molecular mass of 150. What is its molecular formula?
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Question 13 of 20
13. Question
A compound has the empirical formula C_5H_{11}O, and a relative molecular mass of 174. What is its molecular formula?
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Question 14 of 20
14. Question
A compound has the empirical formula CH_3NO_2, and a relative molecular mass of 183. What is its molecular formula?
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Question 15 of 20
15. Question
A compound has the empirical formula C_4H_9Cl, and a relative molecular mass of 185. What is its molecular formula?
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Question 16 of 20
16. Question
A compound has the empirical formula AlO_2, and a relative molecular mass of 177. What is its molecular formula?
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Question 17 of 20
17. Question
A compound has the empirical formula C_{10}H_{20}Br, and a relative molecular mass of 439.8. What is its molecular formula?
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Question 18 of 20
18. Question
A compound has the empirical formula C_2H_6Mg, and a relative molecular mass of 108.6. What is its molecular formula?
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Question 19 of 20
19. Question
A compound has the empirical formula C_{12}H_{24}, and a relative molecular mass of 168. What is its molecular formula?
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Question 20 of 20
20. Question
A compound has the empirical formula C_8H_{14}NO_2Cl, and a relative molecular mass of 383. What is its molecular formula?
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