8. At a particular temperature = 5.7x10-8 for the following reaction: Kp 2 C (s) + 3 H2 (g) C2H6 (g) ⇌ What is the pressure of C2H6 at equilibrium if initially there's 5 g of C and 3 atm of H2? 2 C 3 H2 C2H6 (g) (g) I 5g 3 atm 0 C - 2x - 3x +x E 5g 3 3x x – – x 2 9. is 10.5 at 250.°C for the following reaction: H2 (g) + Cl2 (g) HCl (g) Kp ⇌ A 4.0 L reaction vessel was charged with 0.2 atm of hydrogen, 0.2 atm of chlorine and 0.8 atm of hydrogen chloride at 250.°C. What is the total pressure in the vessel at equilibrium? Since all species in the reaction are present at the onset the reaction will go both ways Kp vs Qp will tell us which direction is going faster – Qp = Qp = =16 Since Kp < Qp the reverse reaction is faster than the forward H2 (g) Cl2 2 HCl (g) (g) I 0.2 0.2 0.8 atm atm atm C +x + x - 2x E 0.2 + 0.2 + 0.8 – x x 2x 10. Which of the following statements concerning equilibrium is true? not a. The value of the equilibrium constant for a given reaction mixture is the same regardless of the direction from which equilibrium is attained. b. The equilibrium constant changes with temperature. c. A system that is disturbed from an equilibrium condition responds in such a way as to restore equilibrium. d. The value of the equilibrium constant changes if one changes the concentration of the products or reactants. e. Equilibrium in molecular systems is dynamic, with two opposing processes balancing one another. 11. Consider the following endothermic reaction at equilibrium: CCl4 (g) C (s) + 2 Cl2 (g) ⇌ a. Is heat absorbed or released as the reaction goes forward? absorbed b. Which way will the reaction shift if the temperature is increased? right c What happens to as the temperature is increased? K increases d. Which way will the reaction shift if the partial pressure of CCl4 is increased? right e. way will the reaction shift if you add more C? no shift
8. At a particular temperature Kp = 5.7x10-8 for the following reaction: 2 C (s) + 3 H2 (g) ⇌ C2H6 (g) What is the pressure of C2H6 at equilibrium if initially there's 5 g of C and 3 atm of H2? 2 C 3 H2 (g) C2H6 (g) I 5g 3 atm 0 C - 2x - 3x +x E 5g – x 3 – 3x x 9. Kp is 10.5 at 250.°C for the following reaction: H2 (g) + Cl2 (g) ⇌ 2 HCl (g) A 4.0 L reaction vessel was charged with 0.2 atm of hydrogen, 0.2 atm of chlorine and 0.8 atm of hydrogen chloride at 250.°C. What is the total pressure in the vessel at equilibrium? Since all species in the reaction are present at the onset the reaction will go both ways – Kp vs Qp will tell us which direction is going faster Qp = Qp = =16 Since Kp < Qp the reverse reaction is faster than the forward H2 (g) Cl2 (g) 2 HCl (g) I 0.2 atm 0.2 atm 0.8 atm C +x + x - 2x E 0.2 + x 0.2 + x 0.8 – 2x 10. Which of the following statements concerning equilibrium is not true? a. The value of the equilibrium constant for a given reaction mixture is the same regardless of the direction from which equilibrium is attained. b. The equilibrium constant changes with temperature. c. A system that is disturbed from an equilibrium condition responds in such a way as to restore equilibrium. d. The value of the equilibrium constant changes if one changes the concentration of the products or reactants. e. Equilibrium in molecular systems is dynamic, with two opposing processes balancing one another. 11. Consider the following endothermic reaction at equilibrium: CCl4 (g) ⇌ C (s) + 2 Cl2 (g) a. Is heat absorbed or released as the reaction goes forward? absorbed b. Which way will the reaction shift if the temperature is increased? right c What happens to K as the temperature is increased? increases d. Which way will the reaction shift if the partial pressure of CCl4 is increased? right e. way will the reaction shift if you add more C? no shift
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