Final answer:
The formula for standard free energy (G°) when ΔG=0 is G° = -RT lnK, where K is the equilibrium constant. At equilibrium, lnK=0, which means that K=1.
Step-by-step explanation:
The formula for standard free energy (G°) when ΔG=0 can be derived from the equation:
G° = -RT lnK
Where G° is the standard free energy change, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin, and K is the equilibrium constant. When ΔG=0, it means that the reaction is at equilibrium, and the equation simplifies to:
lnK = 0
Since the natural logarithm of 1 is 0, this means that when ΔG=0, the equilibrium constant (K) is equal to 1.