When enthyne is passed through a red hot tube, then formation of benzene takes place:
`Delta_(f)H_((C_(2)H_(2))(g))^(Theta) = 230 kJ mol^(-1)`
`Delta_(f)H_((C_(6)H_(6))(g))^(Theta) = 85kJ mol^(-1)`
Calculate the standard heat of trimerisation of ethyne to benzene:
`3C_(2)H_(2)(g) rarr C_(6)H_(6)(g)`