how do i Use bond energies to calculate H° of the following reactions and predict which will react explosively

Question

2 H2(g) + O2(g) 2 H2O(g)

i am getting -800, but it is stating that is wrong ... what am i doing wrong?

[this is a image of the bond energies]http://www.webassign.net/silber/9-02tab.gif

Answer 1

-4*467 + 2*432 + 498 = 506 kJ