Draw a reaction free-energy diagram for a reaction A ⇄B ⇄C that meets the following criteria: Th

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Draw a reaction free-energy diagram for a reaction A ⇄B ⇄C...

Draw a reaction free-energy diagram for a reaction $A \rightleftarrows B \rightleftarrows C$ that meets the following criteria: The standard free energies are in the order $C<A<B$, and the rate-limiting step of the reaction is $B \rightleftarrows C$.

Key Concepts

Rate-Limiting Step

The rate-limiting step is the slowest step in a multi-step reaction mechanism, often corresponding to the highest activation energy barrier. It controls the overall reaction kinetics, as the speed of the entire process is determined by the time required to surmount this barrier.

Activation Energy

Activation energy is the energy barrier that must be overcome for a chemical reaction to proceed from reactants to products. It is indicated by the peaks in a free energy diagram and plays a critical role in determining the reaction rate.

Reaction Coordinate

The reaction coordinate is a parameter that represents the progress of a chemical reaction from reactants to products. It is the horizontal axis of a free energy diagram and helps illustrate the sequence of elementary steps along the reaction pathway.

Standard Free Energy

Standard free energy reflects the thermodynamic stability of species under standard conditions. It is used to compare the relative energies of reactants and products, determining the spontaneity and equilibrium positions of reactions.

Reaction Free Energy Diagram

A reaction free energy diagram graphically depicts the energy changes that occur during the progress of a chemical reaction. It typically plots the free energy of the system on the vertical axis against the reaction coordinate on the horizontal axis, showing the relative energies of reactants, intermediates, transition states, and products.

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