Principle of Microscopic Reversibility.pptx

For M.Sc Chemistry 1st Semester Kinetics of Complex Reaction brief study of principle of microscopic reversibility

1. Principle of Microscopic Reversibility By Aayushi Sharma Assistant Professor (CHEMISTRY) Indus International University, Una(H.P)

2. Principle of Microscopic Reversibility In Mathematical treatment, it was supposed that reactions occurs only in one direction i.e., Forward. It was found that many reactions were reversible. So from this we can define that a reversible reaction is the type of reactions in which a product formed react with each other to give back the reactant in original form under same condition is called as Reversible Reactions. A ⇌ B The principle of microscopic reversibility (PMR) is a fundamental concept in statistical mechanics and thermodynamics. It states that: "The probability of a forward process is equal to the probability of its reverse process, when the system is in equilibrium."

3. Implications 1. Detailed Balance: PMR ensures that the rates of forward and reverse reactions balance each other at equilibrium. 2. Equilibrium Constants : PMR relates equilibrium constants to reaction rate constants. 3. Thermodynamic Consistency: PMR ensures that thermodynamic properties, like free energy, are consistent with kinetic measurements. 4. Onsager Reciprocity Relations: PMR leads to reciprocal relations between kinetic coefficients.

4. Applications 1. Chemical Kinetics: PMR helps predict reaction rates and equilibrium constants. 2. Thermodynamics: PMR ensures consistency between thermodynamic and kinetic measurements. 3. Biological Systems: PMR applies to enzyme-catalyzed reactions and transport processes. 4. Materials Science: PMR informs the design of materials with specific kinetic properties .

5. Limitations 1. Non-Equilibrium Systems: PMR assumes equilibrium conditions. 2. Complex Systems: PMR may not apply to systems with multiple reactions or complex kinetics. 3. Quantum Systems: PMR needs modification for quantum mechanical systems.

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