Review Reaction Rates

Write the equilibrium expression for the following reaction: 2A + 3B ⇌ 4C

• Kc = [C]^4 / ([A]^2 * [B]^3)

• Kc = [C]^4 / ([A]^3 * [B]^2)

• Kc = [B]^3 / ([A]^2 * [C]^4)

• Kc = [A]^2 / ([B]^3 * [C]^4)

What is the effect of adding a catalyst on the equilibrium constant of a reaction?

• Increases the equilibrium constant

• Reverses the direction of the reaction

• No effect

• Decreases the equilibrium constant

Consider the following reaction: CuS(s) + O2(g) ⇌ Cu(s) + SO2(g) A reaction mixture initially contains 3.5 M O2. Determine the equilibrium concentration of O2 if Kc for the reaction at this temperature is 2.0.

• 1.2 M

• 1.8 M

• 2.4 M

• 3.0 M

Calculate the equilibrium constant Kc for the reaction given the following equilibrium concentrations: [N2O4]eq = 1.500 moles, [N2]eq = 2.500 moles, [O2]eq = 3.500 M N2O4(g) ⇌ 2 N2(g) + 2 O2(g)

• Kc = 5.83

• Kc = 51.04

• Kc = .02

• Kc = 12.25

If the equilibrium constant is much less than one (K << 1) then

• Equilibrium is not established.
• Equilibrium lies to the right (products are favored)
• Equilibrium lies to the left (reactants are favored)
• Neither products or reactants are favored.