Chemistry · May / June 2024 · Paper 11 · Question 18
5070Rate of reaction
Excess aluminium reacts with dilute hydrochloric acid. 2Al + 6HCl → 3H2 + 2AlCl3 The hydrogen given off is collected in a gas syringe. The total volume of hydrogen in the gas syringe is recorded every two minutes. The results of this experiment are shown. | time / min | total volume / cm3 | | 0 | 0 | | 2 | 3 | | 4 | 53 | | 6 | 103 | | 8 | 131 | | 10 | 141 | | 12 | 143 | | 14 | 143 | Which statement is correct?
- AThe mass of aluminium added is 0.107 g.
- BThe mass of aluminium added cannot be determined from the information given.
- CThe highest rate of reaction is 71.5 cm3 / min.
- DThe highest rate of reaction is when the acid concentration is highest.
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Correct answer: B. The mass of aluminium added cannot be determined from the information given.
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