Compound W (Mr=160.0M_{\text{r}} = 160.0Mr=160.0) contains carbon, hydrogen and oxygen only. A 3.25×10−4 mol3.25 \times 10^{-4} \text{ mol}3.25×10−4 mol sample of W burns completely in excess oxygen to yield 2.275×10−3 mol2.275 \times 10^{-3} \text{ mol}2.275×10−3 mol of carbon dioxide and 1.95×10−3 mol1.95 \times 10^{-3} \text{ mol}1.95×10−3 mol of water.
Deduce the molecular formula of W. Show your working.