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For which one of the following reactions is ΔH0 for the reaction equivalent to ΔH0,f of the product? a. PCl3 (g) + ½ O2 (g) ⇌ POCl3 (g) b. CaO (s) + SO2 (g) ⇌ CaSO3 (s) c. Al (s) + 3/2 O2 (g) + 3/2 H2 (g) ⇌ Al(OH)3 (s) d. ½ N2O (g) + ¼ O2 (g) ⇌ NO (g)