Question

Water forms according to the equation below:

2H2(g) + O2(g) Right arrow. 2H2O(g) Delta.Hrxn = -483.64 kJ

How much energy is released during the formation of 1 mol H2O(g)?


kJ

Answer 1

The reaction as written produces 2 mol H2O and releases 483.64 kJ. Per 1 mol H2O:

ΔH = -483.64 kJ / 2 = -241.82 kJ.

So 241.82 kJ of energy is released per mole of H2O(g) (ΔH = -241.82 kJ·mol⁻¹).