A student investigates the rate of decomposition of hydrogen peroxide, H2O2(aq)\text{H}_2\text{O}_2(\text{aq})H2O2(aq), at room temperature and pressure (RTP):
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 student uses 40.0 cm340.0\text{ cm}^340.0 cm3 of 1.50 mol dm−31.50\text{ mol dm}^{-3}1.50 mol dm−3 H2O2(aq)\text{H}_2\text{O}_2(\text{aq})H2O2(aq).
Determine the total volume of oxygen gas, in cm3\text{cm}^3cm3 measured at RTP, that the student should be prepared to collect if the decomposition goes to completion. (Assume the molar volume of gas at RTP is 24.0 dm3 mol−124.0\text{ dm}^3\text{ mol}^{-1}24.0 dm3 mol−1.)
Suggest a suitable piece of laboratory apparatus that would allow this volume of gas to be collected, indicating clearly the scale of working.
Suggest an alternative experimental method, other than measuring gas volume, that would allow the rate of this reaction to be followed over time.
29 exam-style questions on OCR A A Level Chemistry How fast?. Each one has a worked solution and a mark scheme showing where the marks go.