Standard enthalpy of formation of ethanol - Help?

2C + 3H2 + 1/2O2 -----> C2H5OH Using bond energies, I got the answer as "-1675kJmol-1" However when I look online everywhere says that it is "-277kJmol-1" The values that I used were: H-H = 436 O=O = 496 C-C = 348 C-H = 412 C-O = 360 O-H = 463 Why is my answer so... show more 2C + 3H2 + 1/2O2 -----> C2H5OH

Using bond energies,
I got the answer as "-1675kJmol-1"
However when I look online everywhere says that it is "-277kJmol-1"

The values that I used were:
H-H = 436
O=O = 496
C-C = 348
C-H = 412
C-O = 360
O-H = 463

Why is my answer so different?
Thanks
1 answer 1