The molecular formula of a hydrocarbon is to be determined by analyzing its combustion products and investigating its colligative properties.
The hydrocarbon burns completely, producing 7.2 grams of water and 7.2 liters of CO2 at standard conditions. What is the empirical formula of the hydrocarbon?
answer: C2H5










Calculate the mass in grams of O2 required for the complete combustion of the sample of the hydrocarbon described in (a).
answer: 16.62 g O2 (2 sig figs: 17 g oxygen)