The first term, ÆG°, is the change in Gibb’s free energy under standard-state conditions;
defined as a temperature of 298 K, all gases with partial pressures of 1 atm, all
solids and liquids pure, and all solutes present with 1 M concentrations. The second
term, which includes the reaction quotient, Q, accounts for nonstandard-state pressures
or concentrations. For reaction 6.1 the reaction quotient is