1. Applications of Equilibrium Constants

2. Example For the reaction below 2A + 3B  2C A 1.5L container is initially charged with 2.3 mole of A and 3.0 mole of B. At equilibrium,.75 mole of A is present. Calculate the value of the equilibrium constant.

3. Example For the reaction PCl 5  PCl 3 + Cl 2 the equilibrium constant K p is.497. A cylinder is charged with PCl 5 at an initial pressure of 2.20 atm. What are the equilibrium pressures of all of the substances?

4. Predicting Reaction Direction If a mixture of reactants and products is not at equilibrium, we can use the equilibrium constant to predict whether the reaction will proceed to the right or left

5. Reaction Quotient (Q) When current concentrations of products and reactants are substituted into the equilibrium constant expression Q > K proceeds left (to reactant) Q = K in equilibrium Q < K proceeds right (to product)

6. Example For the Haber process below, we have found the K c to be.105. If we place 2.00M H 2, 1.00M N 2, and 2.00M NH 3 in the same container, will the reaction proceed to the right or left? N 2 + 3H 2  2NH 3

7. Example At 448°C the equilibrium constant for the reaction H 2 + I 2  2HI is 50.5. Predict the direction in which the reaction will proceed to reach equilibrium if we start with.020 mol of HI,.010 mol of H 2, and.030 mol of I 2 in a 2.0 L container.