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Consider these hypothetical chemical reactions: 1. A ⇌ B, Δ G= 11.9 kJ/mol 2. B ⇌ C, Δ G= -30.3 kJ/mol 3. C ⇌ D, Δ G= 9.20 kJ/mol What is the free energy, ΔG, for the overall reaction, A ⇌ D? Express your answer with the appropriate units.