Problem

Calculate the free energy change for this reaction at 25 °C. Is the reaction spontaneous? (Assume that all reactants and products are in their standard states.) 2 Ca(s) + O2( g) ¡ 2 CaO(s) ΔH° rxn = -1269.8 kJ; ΔSrxn ° = -364.6 J>K

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