Question

Calculate the enthalpy of combustion of methyl alcohol at 298 K from the following data 

Bond	C – H	C – O	O – H	O = O	C = O
Bond Enthalpy (kJ mol-1)	414	351.5	464.5	494	711

Resonance energy of CO₂ = - 143 kJ mol^-1 

Latent heat of vaporization of methyl alcohol = 35.5 kJ mol^-1 Latent heat of vaporization of water = 40.6 kJ mol^-1

Answer 1

= 35.5 + 3/2 × 494 + 351.5 + 464.5 + 3 × 414 – 2 × 711 – 143 – 2 × 40.6 – 464.5 = −669.7