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 graduated gas syringe after 20 seconds20\text{ seconds}20 seconds and after 80 seconds80\text{ seconds}80 seconds.
Determine the number of moles of oxygen collected between 20 seconds20\text{ seconds}20 seconds and 80 seconds80\text{ seconds}80 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.