Q23E - Organic Chemistry (Mcmurry)

Question

Draw an energy diagram for a reaction with ${\mathbf{K}}_{\mathrm{eq}}\mathbf{=}\mathbf{1}$ . What is the value of ${\mathbf{\Delta G}}^o$ in this reaction?

Step-by-Step Solution

Answer

Step 1: Energy profile diagram

An energy profile diagram is a plot of energy against the reaction coordinate.

This shows when the reaction proceeds how the energy of the reactant and product changes.

Step 2: Relation between K eq = 1 and exergonic reaction

When ${\mathrm{K}}_{\mathrm{eq}}$ greater than 1 then the energy is out in the reaction which means the reaction is exergonic.

When ${\mathrm{K}}_{\mathrm{eq}}$ less than 1 is then the energy is in the reaction which means the reaction is endergonic.

If ${\mathrm{K}}_{\mathrm{eq}}$> 1 then ${\mathrm{\Delta G}}^{\mathrm{o}}$ is negative.

If ${\mathbf{K}}_{\mathrm{eq}}$=1 then the reaction does not proceed either in a forward or backward direction.

   And for${\mathbf{K}}_{\mathrm{eq}}$=1 then ${\mathbf{\Delta G}}^o$ =0