A sample of a mixture containing an unknown hydrocarbon and some nitrogen dioxide, NOx, had a total mass of 31.25 grams. The mixture was analyzed using combustion analysis, producing 78.44 g of carbon dioxide, CO2, and 32.12 g of water, H20. a) Calculate the empirical formula of the hydrocarbon.

b) The molar mass of the compound was found to be 252.48 g/mol. What is the molecular formula of the hydrocarbon?

c) What percentage (by mass) of the original sample was the hydrocarbon?