The graph below shows the results of an experiment to measure the rate of reaction between zinc and dilute sulfuric acid, which produces hydrogen gas.
Calculate the mean rate of reaction between 40 and 160 seconds.
Use the graph and the equation:
Mean rate of reaction=Volume of hydrogen formedTime taken\text{Mean rate of reaction} = \frac{\text{Volume of hydrogen formed}}{\text{Time taken}}Mean rate of reaction=Time takenVolume of hydrogen formed
Give your answer to 3 significant figures.