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Which of the following is the standard free energy of formation (AG) for the substance? S(g) + O2(g) → SO2(9) C(s, graphite) + 2H2(g) → CH (9) NH3(g) → 2N2(g) + 1.5H2(g) 2C(s, diamond) + 2H2(g) + O2(g) → CH3COOH (1)

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