Calculate bond enthalpy of C=C in propene.Given standard formation enthalpy of propene is -87.78 kJ/ mol. Bond enthalpies: C-C =347 kJ/ mol C-H=413 kJ /mol H-H=435.4kJ/mol Hsub C(s) toC(g) is 715 KJ/ mol Share with your friends Share 2 Sanjukta answered this Hope it helps you.... 3 View Full Answer