Use average bond energies to calculate δhrxn for this reaction.

NetherCraft 0

Ethane, a minority component of natural gas, burns to form
carbon dioxide and water according to this reaction:
2H3C−CH3(g)+7O2(g)→4CO2(g)+6H2O(g) Note that the average bond
energy for the breaking of a bond in CO2 is 799 kJ/mol. Use average
bond energies to calculate ΔHrxn for this reaction.


balanced equation : 2H3C−CH3(g)+7O2(g)→4CO2(g)+6H2O(g)

DH0rxn = 12*DH0d,C-H + 2*DH0d,C-C + 7*DH0d,O=O + 8*DH0f,C=O +

        = 12*413 + 2*348 +
7*495 +8*(-799) + 12*(-463)

        = -2831 kj

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