Which thermodynamic parameter becomes equal to zero when a reversible chemical system reaches chemical equilibrium at constant temperature and pressure?
Answer and explanation
Correct answer: B. The change in Gibbs free energy (ΔG)
At chemical equilibrium, the rate of the forward reaction equals the rate of the reverse reaction, and the system is at its minimum free energy state. Therefore, the change in Gibbs free energy under reaction conditions is exactly zero (ΔG = 0). The standard free energy change (ΔG° = -RT ln Keq) is a fixed constant and is zero only if Keq = 1.
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