Which of the following relationships are sufficient to ensure that reactants and products will be in their standard states at equilibrium?
I. $\Delta$G = 0
II. $\Delta$G $\circ$ = 0
III. K = 1

Question

Quizplus · Accepted Answer

The standard state of a substance is the state in which it is at a pressure of 1 atm and a temperature of 298 K. At equilibrium, the reactants and products will be in their standard states if the standard free energy change for the reaction is zero. The standard free energy change for a reaction is given by the equation:$$\Delta G^0 = \sum_{i=1}^n \nu_i G^0_i$$where $\Delta G^0$ is the standard free energy change, $\nu_i$ is the stoichiometric coefficient of the $i$th species, and $G^0_i$ is the standard free energy of formation of the $i$th species.If the standard free energy change for a reaction is zero, then the reactants and products will be in their standard states at equilibrium. This is because the standard free energy of formation of a substance is the free energy change for the formation of that substance from its elements in their standard states. Therefore, if the standard free energy change for a reaction is zero, then the free energy change for the formation of the products from the reactants will be zero, and the reactants and products will be in their standard states.Of the given relationships, only II and III are sufficient to ensure that the reactants and products will be in their standard states at equilibrium. Relationship I is not sufficient because it only states that the free energy change for the reaction is zero, but it does not specify that the reactants and products are in their standard states. Relationship III is not sufficient because it only states that the equilibrium constant for the reaction is 1, but it does not specify that the reactants and products are in their standard states.

Which of the Following Relationships Are Sufficient to Ensure That Δ\DeltaΔ

Which of the Following Relationships Are Sufficient to Ensure That $\Delta$