A sample of hydrogen peroxide (H2O2\text{H}_2\text{O}_2H2O2) solution was decomposed in the presence of a manganese(IV) oxide catalyst:
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 reaction produced 145 cm3 of oxygen gas, measured at 21.0 ∘C21.0\text{ }^\circ\text{C}21.0 ∘C and 98.5 kPa.
What is the amount, in moles, of hydrogen peroxide that decomposed?
The gas constant, R=8.31 J K−1 mol−1R = 8.31\text{ J K}^{-1}\text{ mol}^{-1}R=8.31 J K−1 mol−1
2.92×10−32.92 \times 10^{-3}2.92×10−3
5.85×10−35.85 \times 10^{-3}5.85×10−3
1.17×10−21.17 \times 10^{-2}1.17×10−2
1.17×10−51.17 \times 10^{-5}1.17×10−5
79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.