Ethanol, C2H5OH or C2H6O, is mixed with gasoline and sold as gasohol. Given the following thermo-chemical reaction, calculate the kilograms (kg) of CO2 produced when enough ethanol is combusted to provide (or give off) 369 kJ of heat:

Question

C2H5OH (l) + 3 O2 (g) --> 2 CO2 (g) +3 H2O (l);
delta-H rxn = -1235 kJ

Answer 1

1 mole C2H5OH has a mass of 46 grams and will produce 2*44 = 88 g CO2 in producing 1235 kJ of energy. Therefore, how much CO2 is produced when only 369 kJ of heat are produced. That will be
88 x (369 kJ/1235 kJ) = ??