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Math with Equilibrium Expressions. Unit…less – Say it Ain’t So!! . P. 618 Thermodynamic Equilibrium Constants are unit-less!!! . Magnitude of Equilibrium Constants. What is “ k eq ” revealing? What does it mean? Gives us information about composition of equilibrium mixture
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Unit…less – Say it Ain’t So!! • P. 618 • Thermodynamic Equilibrium Constants are unit-less!!!
Magnitude of Equilibrium Constants • What is “keq” revealing? What does it mean? • Gives us information about composition of equilibrium mixture H2 (g) + I2 (g) 2 HI (g)
Comparing K values to 1 • If K >>1, the reaction is product-favored; • product predominates at equilibrium • Equilibrium lies to right
Comparing K values to 1 • If K<<1, the reaction is reactant-favored; reactant predominates at equilibrium. • Equilibrium lies to left.
Example: Which side of reaction would be favored at constant temperature? Reactants Favored Products Favored Turn to pg. 620 Complete Practice Exercise Get out Eq. Worksheet, Complete #10
DirectionalImportance 2 N2 (g) + 3 H2 (g) 2 NH3 (g) • Keqexpression of the forward reaction is the reciprocal of the Keq expression of the reverse reaction. • RECIPROCALS! Keqforward = _____1______ Keqreverse Turn to pg. 621 Complete Practice Exercise
Combining Equilibria • Turn to pg. 622 Sample Exercise 15.5 • Similar Approach as Hess’s Law: 1. Reverse is reciprocal 2. Multiplier becomes exponent 3. Two or more reactions: Eq. constant = [product] x [of the two] Eq. constant = [K1] x [K2]
