Calculate ΔrH for the following reaction:P4(g) + 10Cl2(g) → 4PCl5(s)Express your answer to 4 significant figures. Use the following reactions and given ΔrH's:PCl5(s) → PCl3(g) + Cl2(g)    ΔrH° = +157 kJ mol-1P4(g) + 6Cl2(g) → 4PCl3(g)   ΔrH° = –1207 kJ mol-1

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