Problem: Use standard entropies to calculate ΔS˚rxn for the balanced chemical equation: 2 PCl3(l) + O2(g) →  2 POCl3(l)SubstanceΔS˚ (J/mol•K)POCl3(l)222.5POCl3(g)325.5PCl3(l)217.1PCl3(g)311.8O2(g)205.2

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S°rxn=S°product-S°reactants

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Use standard entropies to calculate ΔS˚rxn for the balanced chemical equation: 2 PCl3(l) + O2(g) →  2 POCl3(l)

SubstanceΔS˚ (J/mol•K)
POCl3(l)222.5
POCl3(g)325.5
PCl3(l)217.1
PCl3(g)311.8
O2(g)205.2