Equilibrium [1]

Equilibrium [1] - Chemical Equilibrium Chapter 14 Chem 6BH...

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1 6BH-Equilibrium (Basics) Keq Basics- 1 Chemical Equilibrium Chapter 14 Chem 6BH 6BH-Equilibrium (Basics) Keq Basics- 2 Introduction We have assumed that when a reaction goes to thermodynamic completion ( G = 0) all starting materials have been converted to products •Many reactions do NOT go to chemical completion, but rather approach equilibrium . – Once achieved, the composition of the reaction will not change; – Quantitatively we can describe this using an Equilibrium Constant ( K or K x ). Begin with an empirical examination of the Haber process
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2 6BH-Equilibrium (Basics) Keq Basics- 3 Equilibrium: Empirical Examination Plot [Reactants] vs. t Plot [Product] vs. t Examine reverse reaction: Isotope experiment: 22 3 3 H ( ) N ( ) 2 NH ( ) gg g ⎯⎯→ + ←⎯⎯ 32 2 2 NH() 3 H() N() g + 3 3 3 D ( ) N ( ) 2 ND ( ) 3 H ( ) N ( ) 2 NH ( ) g g + + 6BH-Equilibrium (Basics) Keq Basics- 4 Equilibrium: Empirical Conclusions • Equilibrium is established from either direction; • Values obtained for [H 2 ] eq , [N 2 ] eq , and [NH 3 ] eq are different depending on direction, amounts started with, temperature, etc. but a steady state is achieved regardless .
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Equilibrium [1] - Chemical Equilibrium Chapter 14 Chem 6BH...

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