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

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