dHrxn = [BE reactants] = [BE products]
Here is tutorial
http://www.kentchemistry.com/links/Kinetics/BondEnergy.htm
Post your work if you get stuck.
Using the following bond energies, calculate the molar heat of hydrogenation, ΔHhydrogenation, for the conversion of C2H2 to C2H6
CH (triple bond) CH (g) + 2H2 (g) --> CH3CH3 (g)
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