Which of the following gas will liberate maximum heat on combustion, per gram? — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

The heat of combustion per gram (calorific value) is highest for hydrocarbons with the maximum mass percentage of hydrogen. Methane ($\text{CH}_4$) has the highest hydrogen-to-carbon ratio among the choices, yielding approximately 55 kJ/g.