Lecture_23 - 6 Routes for calculating the free energy...

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1 6.Routes for calculating the free energy change in chemical reactions This section will be covered in this week’s recitation sessions. 7. Dependence of free energy on pressure Equilibrium position the lowest free energy value available to a particular system. Dependence of G on the pressure of an ideal gas . H does not depend on P . S does depend on pressure ( P ) because of its strong dependence on volume. S large volume > S small volume S low pressure > S high pressure G = G ° + RT ln P G ° = G (1.00 atm) Consider the gaseous reaction: N 2 (g) + 3 H 2 (g) 2 NH 3 (g) G = G ° + RT ln Q + = + + + = = 2 2 3 2 2 3 2 2 2 2 3 3 2 2 3 3 2 . ln ] 3 2 [ ] ln [ ] ln [ 3 ] ln [ 2 3 2 N H NH N H NH N N H H NH NH N H NH Rxn P P P RT G G G P RT G P RT G P RT G G G G G o o o o o o Q reaction quotient G °
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2 Physical significance of G Rxn : The system can achieve the lowest possible free energy by going to
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Lecture_23 - 6 Routes for calculating the free energy...

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