The results recorded here show that the reaction had finished by four minutes, as no more gas was produced after that. The mean rate of reaction = 50 ÷ 4 = 12.5 cm 3 /min However, the rate decreased ...
Don't forget to take a ruler and scientific calculator into the exam. Maths questions often start with the command word calculate. You need to use numbers given in the question to work out the answer.
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