During the catalytic decomposition of hydrogen peroxide at 20 ∘C20\text{ }^{\circ}\text{C}20 ∘C, the volume of oxygen gas produced was measured. In the first 2 minutes and 5 seconds2\text{ minutes and } 5\text{ seconds}2 minutes and 5 seconds, a total of 35.0 cm3 of oxygen was collected.
Calculate the average rate of reaction, in cm3 s−1\text{cm}^3\text{ s}^{-1}cm3 s−1, for this time period. Give your answer to 3 significant figures.
127 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.