For which one of the following reactions is the value of ∆Horxn equal to ∆Hof for the product?
A.2H2 (g) + O2 (g)‡2H2O(g)
B.H2O(l) + 1/2O2 (g)‡H2O2 (l)
C.N2 (g) + O2 (g)‡2NO(g)
D.2H2 (g) + O2 (g)‡2H2O(l)
E.2C(s,graphite) + 2H2 (g)‡C2H4 (g)