The heat of combustion of acetylene is 312 kcal

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

The heat of combustion of acetylene is 312 kcal. If heat of formation of

\text{CO}_2

and

\text{H}_2\text{O}

are 94.38 and 68.38 kcal respectively, calculate

\text{C}\equiv\text{C}

bond energy. Given that heat of atomisation of C and H are 150.0 and 51.5 kcal respectively and C—H bond energy is 93.64 kcal.