Find the ΔH for the reaction below, given the following reac…

Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:PCl5(g)  →  PCl3(g)  +  Cl2(g) P4(s)  +  6Cl2(g)  →  4PCl3(g)            ΔH = -2439 kJ4PCl5(g)  →  P4(s)  +  10Cl 2(g)         ΔH = 3438 kJ