A researcher investigated the rate of decomposition of hydrogen peroxide using a manganese(IV) oxide catalyst. The table below displays the volume of oxygen gas evolved after 80 seconds80\text{ seconds}80 seconds across four identical trials:
| Trial | Volume of oxygen collected in cm3\text{cm}^3cm3 |
|---|---|
| Trial 1 | 74.1 |
| Trial 2 | 75.5 |
| Trial 3 | 42.8 |
| Trial 4 | 74.9 |
Calculate the mean volume of gas collected at 80 seconds80\text{ seconds}80 seconds.
Do not include the anomalous result in your calculation.
Give your answer to 3 significant figures.
26 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1 Calculating rates of reactions, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.