Chemistry 5070 · O Level · Rate of reaction

Rate of reaction — practice question

An excess of aluminium is allowed to react with dilute hydrochloric acid. $2\text{Al} + 6\text{HCl} \rightarrow 3\text{H}_2 + 2\text{AlCl}_3$ The hydrogen produced is gathered in a gas syringe. The overall volume of hydrogen in the gas syringe is measured at two-minute intervals. The outcomes of this experiment are shown. Which statement is correct?

  • AThe mass of aluminium added is $0.107\ \text{g}$.
  • BThe mass of aluminium added cannot be determined from the information given.
  • CThe highest rate of reaction is $71.5\ \text{cm}^3\ \text{min}^{-1}$.
  • DThe highest rate of reaction is when the acid concentration is highest.

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