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.