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4. Calculate the enthalpy of decomposition of phosphorus oxychloride in the following reaction: 10Cl3PO(g) → P4O10(s) + 6PCl5(g) Use the following four equations: a) 4PCl3(g) → P4(s) + 6Cl2(g) ΔH°f = +1225.6 kJ/mol b) P4(s) + 5O2(g) → P4O10(s) ΔH°f = -2967.3 kJ/mol c) PCl5(g) → PCl3(g) + Cl2(g) ΔH°f = +84.2 kJ/mol d) PCl3(g) + 1/2O2(g) → Cl3PO(g) ΔH°f = -285.7 kJ/mol