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Standard free energy and free energy are related through the standard state. Standard free energy is the free energy of a system under standard state conditions, which are typically 298 K and 1 atm. Free energy is the free energy of a system under non-standard state conditions. The difference between standard free energy and free energy is given by the equation ΔG = ΔG° + RTlnQ, where ΔG is the free energy, ΔG° is the standard free energy, R is the gas constant, T is the temperature, and Q is the reaction quotient.