A student investigated the rate of decomposition of hydrogen peroxide in the presence of a manganese(IV) oxide catalyst. The equation for the reaction is:
2H2O2(aq)→2H2O(l)+O2(g)2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O}\text{(l)} + \text{O}_2\text{(g)}2H2O2(aq)→2H2O(l)+O2(g)
The diagram below shows the volume of oxygen gas collected in a gas syringe after 30 seconds30\text{ seconds}30 seconds and after 110 seconds110\text{ seconds}110 seconds.
Determine the number of moles of oxygen collected between 30 seconds30\text{ seconds}30 seconds and 110 seconds110\text{ seconds}110 seconds.
The volume of one mole of any gas at room temperature and pressure is 24 dm324\text{ dm}^324 dm3.
Give your final answer to two significant figures.