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Choose the one alternative that best completes the statement or answers the question. Calculate the standard free energy change at 25°C for the reaction 2 NO(g) +O2(g) →2 NO2(g). Species ΔH°f, kJ/mol S°, J/(K ∙ mol) NO (g) 91.3 210.7 O2 (g) 0.0 205.0 NO2 (g) 33.2 240.0 A) -532.6 kJ B) -72.6 kJ C) -157.8 kJ D) -4.7 kJ