An environmental analysis of an unidentified organic volatile compound, Z (Mr=88.0M_{\text{r}} = 88.0Mr=88.0), shows that it consists solely of carbon, hydrogen, and oxygen. During a precision combustion analysis, a 3.50×10−4 mol3.50 \times 10^{-4} \text{ mol}3.50×10−4 mol sample of Z was completely oxidized in excess oxygen, producing 1.75×10−3 mol1.75 \times 10^{-3} \text{ mol}1.75×10−3 mol of carbon dioxide and 2.10×10−3 mol2.10 \times 10^{-3} \text{ mol}2.10×10−3 mol of water vapour.
Determine the molecular formula of Z. You must show your complete working.
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.