13.1 Equilibrium and Equilibrium Constants

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Equilibrium graph

Equilibrium Constants (Law of Mass Action)

Equilibrium Constants
K>>1 Favors Products
K<<1 Favors Reactants
10-3 < K < 103 Reactants and products both
present at equilibrium

2C(s) + O2(g) ⇌ 2CO(g)
What is the equilibrium constant expression for the reaction above?

Equilibrium constants are CONSTANTS. The constant will only change with a change in temperature.

Kp vs Kc

Kp = Kc (RT)Δn           Δn = change in moles gas          R = 0.0821 L • atm / mol • K

2SO2 + O2 ⇌ 2SO3      Kc = 278
Based on the reaction above, what are the equilibrium constants for the following reactions?

2SO3 ⇌ 2SO2 + O2

SO2 + ½O2 ⇌ SO3

SO3 ⇌ SO2 + ½O2