Exam 15: Equilibria: How Far Do Reactions Go

Chlorine reacts with sulfur dioxide to produce thionyl chloride according to the following equilibrium reaction: SO₂ + Cl₂ ⇌ SO₂Cl₂. The forward reaction is exothermic. What will be the consequences of adding more Cl₂ to the reaction when the reaction is at equilibrium?

Consider the reaction 3O₂ ⇌ 2O₃ for which H of the forward reaction is +280 kJ mol^-1. If we increase the temperature when the reaction mixture is at equilibrium, what can we expect to happen?

What is the equilibrium constant for the reaction A + 2B ⇌ 3C if the equilibrium concentrations are [A] = 0.413 M, [B] = 0.414 M, [C] = 0.228 M

Consider the reaction N₂ + O₂ ⇌ 2NO. At 1800 C, this reaction has an equilibrium constant of 1.2  10^-4. During the course of the reaction, a sample of the reaction mixture is taken, and the concentrations of each component are found to be as follows: [N₂] = 0.055 mol L^-1, [O₂] = 0.081 mol L^-1, and [NO] = 0.003 mol L^-1. In which direction must the reaction proceed for it to reach equilibrium?

Which of the following phrases correctly complete the sentence "When G = 0 for a chemical reaction, …". Select all that apply.

A large negative G for a reaction suggests which one of the following?

Nitrogen and oxygen react together according to the following equilibrium reaction: N₂(g) + O₂(g) ⇌ 2 NO(g) If the equilibrium constant for this reaction, K_p, is 2  10^-37 at a given temperature what is the partial pressure of NO at equilibrium?

What is the equilibrium constant for the reaction A + B ⇌ 2C if the equilibrium concentrations are: [A] 0.419 M, [B] 0.329 M, [C] 97.2 mM?

If the reaction N₂O₄ ⇌ 2NO₂ is at equilibrium and more N₂O₄ is fed into the reaction mixture, what will happen?

In the reaction H₂ + I₂ ⇌ 2HI, the equilibrium constant at 400C is 500. Which of the following statements are true when the reaction is at equilibrium? Select any that apply.

Consider the equilibrium reaction A + 2B ⇌ 3C. When the reaction mixture is sampled prior to equilibrium being reached, it is determined that the reaction must proceed to the left for equilibrium to be reached. When the reaction mixture is sampled at equilibrium, the following concentrations are measured: [A] 0.267 mol L^-1, [B] 0.336 mol L^-1 , [C] 0.173 mol L^-1. What were the most likely concentrations of A, B, and C when the reaction mixture was sampled prior to equilibrium?

Which of the following statements about equilibrium reactions are true? Select all that apply.

Consider the following equilibrium reaction: CH₄ + H₂O ⇌ CO + 3H₂. At 298 K, K = 9.4  10^-1 Which of the following statements in relation to this reaction are true? Select all that apply.

What is the equilibrium constant for the reaction A ⇌ 2B if the equilibrium concentrations are [A] = 4.27  10^-2 M, [B] = 1.41  10^-2 M?

Consider the equilibrium reaction N₂ + O₂ ⇌ 2NO. The equilibrium constant for this reaction is represented by which one of the following?

The binding of a potential substrate to an enzyme has a large dissociation constant, K_d. Therefore the enzyme and substrate show a strong affinity for each other.

The equilibrium constant for the equilibrium reaction N₂ + 3H₂ ⇌ 2NH₃ is 70 at 500C. If 0.56 mol of NH₃, 0.42 mol of N₂ and 0.67 mol H₂ are injected into a flask, how will the reagents behave? Select all responses that apply.