Hussein H.

# what is the standard enthalpy change for the reaction

Given the standard enthalpy changes for the following two reactions:

(1) 2Ni(s) + O2(g)2NiO(s)...... ΔH° = -479.4 kJ

(2) Ni(s) + Cl2(g)NiCl2(s)......ΔH° = -305.3 kJ

what is the standard enthalpy change for the reaction:

(3) 2NiCl2(s) + O2(g)2NiO(s) + 2Cl2(g)......ΔH° = ?