Given the following data:

4PCl5(s) ¨ P4(s) + 10Cl2(g) ƒ¢H = +1774 kJ
P4(s) + 6Cl2(g) ¨ 4PCl3(l) ƒ¢H = -1278.8 kJ

Find the ĢH of the following reaction:

PCl5(s) ¨ PCl3(l) + Cl2(g)

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