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Hess law manipulating equations

Assignment:

Given the following thermochemical equations

2KCl(s) + 3O₂(g) .......2KClO₃(s) Change in H = 78.0kJ
P₄(s) + 6Cl₂(g)..........4PCl₃(g) Change in H = -1148.0kJ
P₄(s) + 2O₂(g) + 6Cl₂(g).........4POCl₃(g) Change in H = -2168.8kJ

Calculate change in H for the reaction

KClO₃(s) + 3PCl₃(g)..........3POCl₃ + KCl(s)

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