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Homework Statement
Enthalpies of fumaric and succinic acid are as follows:
Fumaric:
dH(combustion) = -1336kJ/mol
C4H4O4(s) + 3O2 -> 4CO2(g) + 2H2O(l)
Succinic:
dH(combustion) = -1469kJ/mol
C4H6O4(s) + 3.5 O2(g) -> 3H2O(l)
Find the energy of the C=C bond
BE:
H-H: 432 kJ/mol
C-H: 413 kJ/mol
C-C: 347 kJ/mol
dH(formation)
H2O(l): -241.8 kJ/mol
CO2(g): -393.5 kJ/mol
Homework Equations
dH(combustion) ≠ dH(formation)
dH(formation) = sigma(BE reactants) - sigma(BE products) + dH(formation)