Equation based on equilibrium

[305174946]

Can someone please explain the G=G+RTlnQ equation please. Lavelle wrote Q is reaction quotient not K, is he just emphasizing that its not at equilibrium? I thought it was....?

[Samantha Kwock 1D]

The G= G + RTlnQ equation holds true for all reactions, even reactions not at equilibrium. However, for reactions at equilibrium, G=0 and Q=K so G=-RTlnK.

[michelle]

Actually, it should be G=G knot + RTlnQ. It implies that the reaction is not at equilibrium.

[EllaBerry]

You would use the equation with the K when the reaction is at equilibrium. Meanwhile, use the equation with the Q at any time.

[katie_sutton1B]

K indicates equilibrium, so you would use that equation for a reaction at equilibrium. You would use Q when it not.

[KHuang1L]

Delta G = Delta G under standard conditions + RTlnQ is used when the reaction is not at equilibrium. When the reaction is at equilibrium, you use the equation delta G under standard conditions = -RTlnK because delta G is equal to zero and the equilibrium constant can be used.