Enthalpies of combustion of , and are –890, –1411 and –1560 kJ/mole, respectively. Which has the hig — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

Fuel value is enthalpy per gram. $\text{CH}_4$: $890/16 = 55.6\text{ kJ/g}$. $\text{C}_2\text{H}_4$: $1411/28 = 50.4\text{ kJ/g}$. $\text{C}_2\text{H}_6$: $1560/30 = 52.0\text{ kJ/g}$. Methane ($\text{CH}_4$) provides the highest heat per gram.