Phosphorus pentachloride is used in the industrial preparation of organic phosphorus compounds. Equation 1 shows its preparation

Question

Phosphorus pentachloride is used in the industrial preparation of organic phosphorus compounds.
Equation 1 shows its preparation from PC13(0) and Cl₂(g):
(1) PCl3(l) + Cl₂(g) → PCl5(g)
Use equations (2) and (3) to calculate ΔHn of equation (1):
(2) P4(s) + 6Cl₂(g) → 4PC13(l)    ΔH = -1280 kJ
(3) P4(s)+10Cl₂(g) → 4PCL5(g)    ΔH=-1774 kJ

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