When
H₂(g) reacts with
O2 (g) according to the following
reaction, 242 kJ of energy are evolved
for each mole of
H₂(g) that reacts. Complete the
following thermochemical equation.

2H₂(g) + O2(g) → 2H₂O(g) ΔΗ=?
ΔΗ=_____kj