Problem- A gaseous mixture contains 25.3% methane, 38.2% ethane and the rest is propane by volume. When the fuel mixture contained in a 1.55-L tank, stored at 755 torr and 298 K, undergoes complete combustion, how much hear is emitted? (Assume that the water produced by the combustion is in the gaseous state.) .... The answer from the textbook is 94.1kJ.

I used PV=nRT to get moles, = 0.0629 mol.

Then used the deltaH of each compound to ascertain the delta fH of each reaction. Multiplied those by each of the given percentages, to compile the amount of heat from each reaction. Added these together and multiple by the moles. And my answer was

Provide your answer in scientific notation