Posted by sara on Tuesday, January 22, 2013 at 6:08pm.
Hf for aluminum oxide is -1669.8 kJ/mole
Why are you making this so complicated?
Oxygen as an element is O2, and of course, its heat of formation is zero.
If you had asked what is the heat of formation from atoms, the question would be quite different.
what is the change in enthalpy for CH4(g) + 2O2(g)----->CO2(g)+2H20(I)
CH4: -74.86
CO2: -393.5
H2O: -285.5
I got triangle H: 890KJ/Mol is that correct?
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