A reaction occurs according to the equation: 2A (aq) ⇌ Y (aq) + 2Z (aq)   In a 5-L vessel, 4 moles of A are initially present. At equilibrium, it was found that 1 mole of A remained.   1. Doubling the volume of the reaction vessel will favor the formation of more Y. a. True b. False 2. Calculate the reaction quotient Q when the vessel was found to contain 1 mole of each of the species?  3. Based on the calculated values of Q and Kc, at what direction shall the reaction proceed to attain equilibrium?

Consider the following reaction: COCl2(g)  ⇌   CO(g) + Cl2(g)  A reaction mixture initially contains 1.6 M COCl2. Determine the equilibrium concentration of CO if Kc for the reaction at this temperature is 8.33 ×  10 -4 . Calculate this based on the assumption that the answer is negligible compared to 1.6.   A 1.3 × 10-3 M   B 1.5 × 10-3 M   C 2.1 × 10-2 M   D 3.7 × 10-2 M   E 4.2 × 10-4 M

At a certain temperature, Kc equals 4.0 × 102 for the reaction:              CO(g) + O2(g)  ⇌   CO2(g). If a 4.00-L flask contains 0.600 mol of CO2 and 0.200 mol of O2 at equilibrium, how many moles of CO are also present in the flask?

3. Determine the reaction quotient and predict the direction that each of the following reactions will proceed to reach equilibrium: Keq = 4.6 × 10¹ a. A 1.00 L flask containing 0.0500 mol NO (g), 0.0155 mol Cl₂ (g), and 0.500 mol NOCI(g): 2NO(g) + Cl₂(g) = 2NOCI(g) A: shift right b. A 5.00 L flask containing 14 g N₂ (g), 12 g H₂ (g), and 17 g NH3(g): N₂(g) + 3H₂(g) = 2NH3(g) Keq = 0.060 (at 526 °C) c. A 2.00 L flask containing 230 g SO3 (8) 2SO3(g) = 2SO₂(g) + O₂(8) Keq = 0.230 A: shift left A: shift right

Assume that the following exothermic chemical reaction is at equilibrium. CuO (s) + H2 (g) ⇌ H2O (g) + Cu (s). Which of the following statements is CORRECT? Choose one option. a. Increasing the concentration of H2 (g) will cause the reaction to proceed in the backward direction (shift to left), increasing the equilibrium concentration of H2O (g). b. Decreasing the temperature will cause the reaction to proceed in the forward direction (shift to right), increasing the equilibrium concentration of H2O (g). c. Increasing the amount of CuO(s) will cause the reaction to proceed in the forward direction, increasing the equilibrium concentration of H2O (g). d. Increasing the temperature will cause the reaction to proceed in the forward direction (shift to right), increasing the value of the equilibrium constant of this reaction. e. The value of the equilibrium constant for this reaction will stay the same after the temperature is increased.

20

Consider the following equilibrium: 2NOC1(g)= 2NO(g) + Cl2(g) with K= 1.6 x 10. 1.00 mole of pure NOC1 and 0.981 mole of pure Cly are placed in a 1.00-L container. Calculate the equilibrium concentration of NO(g). on Select one: O a. 9.81 × 10-M O b. 1.02 M O c.4.04 x 10-3M O d. 2.02 x 10- M O e. 5.71 x 10M nere to search F4 F5 FG FZ F8 F9 F10 F11 F12 PriScr 23 %24 3 6. E R T D G H K C V B N M

Consider the reaction A + B C+D, which has an equilibrium constant, K, equal to 3.4 x 102. If one begins a reaction by placing 0.600 moles of A in a 1.0 L container as well as 0.150 moles of 1. B, what will be the equilibrium concentrations of A, B, C, and D? Write your answers in the spaces provided below. a. [А] b. [B]= [C]= С. d. [D]= Once the reaction in problem 1 reaches equilibrium, some additional B is injected into the flask 2. from an outside source. LeChatelier's principle says the reaction will (circle one): be unchanged shift to the right shift to the left Pyridine is a weak base with a Kb 1.7 x 109. If 0.300 moles of pyridine is added to 1.00 L of 3. water, what will be the equilibrium concentrations of the species below: a. [Pyridine] = b. [Pyridine-H] (the pyridinium ion) [ОН-] 3 С. What is the pH of the solution in problem 4 (above)? .

A 1.0L flask is filled with 1.8 mol H2 and 1.2 mol 12. The equilibrium reaction that takes place (shown below) has a Kc = 4.86. Determine the equilibrium concentration of HI. H2 (g) + 2 (g) 2 HI(g) O0.75 O 1.0 1.5 0.50

For the following chemical reaction,      CO (g)   +   H2O (g)      CO2 (g)   +   H2 (g)     Kc = 0.0257 If a 2.00L vessel is charged with 0.200 moles of CO, 1.13 moles of H2O, 0.199 moles of CO2, and 0.175 moles of H2, what is the equilibrium concentration of CO?     a. 0.610M   b. 0.054M   c. 0.264M   d. 0.0451M   e. 0.145M