Chemistry - Thermochemistry Question with Solution | TestHub

The enthalpy of combustion of acetylene is -312 kcal per mole. If enthalpy of formation of ${\mathrm{CO}}_2$ & ${\mathrm{H}}_2\mathrm{O}$ are - 94 & -68 kcal per mole respectively, calculate $\mathrm{C}\equiv \mathrm{C}$ bond enthalpy (in $\mathrm{Kcal}/\mathrm{mol}$ ).

Given that enthalpy of atomisation of C is 150 kcal per mole and H – H bond enthalpy and C – H bond enthalpy are 103 kcal per mole and 93 kcal per mole respectively.