Question

Use bond energies to predict the molar enthalpy of combustion of acetylene gas.
2C2H2 + 5O2--> 4CO2 + 2H2O

I am confused as to how to do the 2C2H2 in relation to the bonds?

how many c-c bonds would there be, or would they be triple bonds?

Answer 1

The way I read it you break 4 C-H bonds, 1 CtriplebondC bond and 1 O-0 bond (on the reactant side) and form 8 C=O bonds, and 4 O-H bonds on the product side.