1. What mass of butane in grams is necessary to produce 1.5 x 10^3 kJ of heat? What mass of CO2 is produced? C4H10 + 13/2 O2 --> 4 CO2 + 5 H2O Heat of reaction = -2658 kJ 2. 3. Mass of butane = 33g Mass of CO2 = 176.04g <-- This is wrong and the right answer is 99g CO2 How is that so..