Use the bond enthalpy values below to calculate the enthalpy of combustion C12H26(g) + 18.5O2(g) = 12CO2(g) + 13H2O(g)?

C=O 750kjmol-1

H-O 463kjmol-1

C-H 413kjmol-1

C-C 348kjmol-1

O=O 496kjmol-1

I got -6296?

Teacher told us she knows there is no such this as 18.5 O2 but it's just an example
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