Q7. The Enthalpy change ( H ) for a reaction is given below.

H2 (g) + 1/2 O2 (g) H2O(l) H = 286 kJ

Use the above enthalpy change to find the Enthalpy change for the following reactions.

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

b) 1/ 2 H2 O(l) 1/ 2 H2 (g) + 1/ 4 O2 (g