O-LevelChemistryRates of Reaction5070/11 · May/June 2024 · Q181 Mark
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.
✓ Correct answer
B: The mass of aluminium added cannot be determined from the information given.
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