Chemistry - Thermochemistry Question with Solution | TestHub

The heats of combustion per gram are calculated as follows:

For CH_₄: 890/16 ≈ 55.6 kJ/g

For C_₂H_₆: 1560/30 = 52 kJ/g

For C_₂H_₂: 1300/26 = 50 kJ/g

For C_₂H_₄: 1411/28 ≈ 50.4 kJ/g

Methane (CH_₄) provides the most heat per gram. Therefore, the correct option is (a).