Question

For which reaction is ∆Hº(rxn) equal to ∆Hºf of the product?
a) N2(g) + O2(g) → 2NO(g)
b) 2H2(g) + O2(g) → 2H2O(l)
c) 2H2(g) + O2(g) → 2H2O(g)
d) H2O (l) + 1/2O2(g) → H2O2(l)
e) none of the above


I don't understand why it wouldn't be c?

Answer 1

and why wouldn't it be a? (the answer is e-none of the above)