16_Chapt15 - Gas Phase Equilibrium Chemical Equilibrium...

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Mary J. Bojan Chem 110 1 Gas Phase Equilibrium Chemical Equilibrium Equilibrium Constant K eq Equilibrium constant expression Relationship between K p and K c Heterogeneous Equilibria Meaning of K eq Calculations of K c Solving Equilibrium Problems USING AN EQUILIBRIUM CONSTANT Information obtained from K c 1. Predict direction of a reaction Q reaction quotien 2. Obtaining equilibrium concentrations of reactants and products.
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Mary J. Bojan Chem 110 2 Equilibrium Equilibrium is achieved when opposing processes proceed at equal rates. equilibria previously discussed Eg.
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Mary J. Bojan Chem 110 3 Chemical Equilibrium In chemical equilibria, forward and reverse reactions occur at equal rates. N 2 O 4 (g) 2NO 2 (g) colorless brown
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Mary J. Bojan Chem 110 4 Achieving equilibrium: The relationship between the concentrations of products and reactants at “equilibrium” will be the same regardless of starting conditions. Initial State : reactants only Initial state : products only
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Mary J. Bojan Chem 110 5 Equilibrium Constant Equilibrium point of any reaction is characterized by a single number . In general: jA + kB pR + qS Example: B(g) 2 A (g) N 2 O 4 2 NO (g)
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Mary J. Bojan Chem 110 6 EXPRESSION for K eq What is the equilibrium constant expression for the Haber process? N 2 (g) + 3H 2 (g) 2NH 3 (g)
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Mary J. Bojan Chem 110 7 Equilibrium Constant The ratio of equilibrium concentrations will be constant: K eq is the equilibrium constant for the reaction. It is a NUMBER . K eq (the number) DOES NOT depend on concentration It’s a function of temperature only. Notation: K eq = K c K c = R [ ] p S [ ] q A [ ] j B [ ] k concentration [ ] is expressed in M (mol/L) K p p p p p R p S q A j B k = concentration is expressed using partial pressures in atm K eq = K p
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Mary J. Bojan Chem 110 8 n c p (RT) K K Δ = When given K eq how do I know if it is K c or K p ? Use context of problem. If concentrations are given in M , then K eq = K c If concentrations are given in P , then K eq = K p where Δ n = n prod n react Relationship between K p and K c
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Chem 110 9 Calculating K p and K c Equilibrium concentrations of NH 3 , N 2 , and H 2 were determined at 472 ° C. [H
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16_Chapt15 - Gas Phase Equilibrium Chemical Equilibrium...

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