At constant volume at `27^(@) C`,
`2C_(6)H_(6)(g)+150_(2)(g) to 12CO_(2)(g)+6H_(2)O(l), Delta u=-1600 kcal`
`2C_(2)H_(2)(g)+5O_(2)(g) to 4CO_(2)(g)+2H_(2)O (l), Deltau=-620 kcal`
Calculate the heat of polymerisation of acetylene to benzene at constant pressure.

Answer

(-131.2 kcal)