2SO 2(g) + O 2(g) Increasing the temperature. (Total 1 mark) Enthalpy data for the reacting species are given in the table below.

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Lesley Collin Grant
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1 Q1.Which change would alter the value of the equilibrium constant (K p) for this reaction? 2SO 2(g) + O 2(g) 2SO 3(g) A Increasing the total pressure of the system. Increasing the concentration of sulfur trioxide. C Increasing the concentration of sulfur dioxide. Increasing the temperature. Q2.This question is about the reaction given below. CO(g) + H 2O(g) CO 2(g) + H 2(g) Enthalpy data for the reacting species are given in the table below. Substance CO(g) H 2O(g) CO 2(g) H 2(g) ΔH / kj mol Which one of the following statements is not correct? A C The value of K p changes when the temperature changes. The activation energy decreases when the temperature is increased. The entropy change is more positive when the water is liquid rather than gaseous. The enthalpy change is more positive when the water is liquid rather than gaseous. Page 2

2 Q3.The equation for the combustion of butane in oxygen is C 4H O 2 4CO 2 + 5H 2O The mole fraction of butane in a mixture of butane and oxygen with the minimum amount of oxygen required for complete combustion is A C C Page 3

3 Q4.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). The mole fraction of SO 3 in the equilibrium mixture is A C Page 4

4 Q5.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). With pressures expressed in MPa units, the value of the equilibrium constant, K p, is A C Page 5

5 Q6.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). Possible units for the equilibrium constant K p include A C no units kpa Mpa 1 kpa 2 Page 6

6 Q7.This question relates to the equilibrium gas-phase synthesis of sulphur trioxide: 2SO 2(g) + O 2(g) 2SO 3(g) Thermodynamic data for the components of this equilibrium are: SO 3(g) SO 2(g) O 2(g) This equilibrium, at a temperature of 585 K and a total pressure of 540 kpa, occurs in a vessel of volume 1.80 dm 3. At equilibrium, the vessel contains mol of SO 2(g), mol of O 2(g) and mol of SO 3(g). At equilibrium in the same vessel of volume 1.80 dm 3 under altered conditions, the reaction mixture contains mol of SO 3(g), mol of SO 2(g) and mol of O 2(g) at a total pressure of 623 kpa. The temperature in the equilibrium vessel is A 307 C 596 K C 337 C 642 K Page 7

7 Q8.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH 3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) Possible units for the equilibrium constant, K p, for this reaction are A C no units kpa MPa 1 kpa 2 Page 8

8 Q9.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH 3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) The mole fraction of hydrogen in the equilibrium mixture is A C Page 9

9 Q10.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH 3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) With pressures expressed in MPa units, the value of the equilibrium constant, K p, under these conditions is A C Page 10

10 Q11.The following information concerns the equilibrium gas-phase synthesis of methanol. CO(g) + 2H 2(g) CH3OH(g) At equilibrium, when the temperature is 68 C, the total pressure is 1.70 MPa. The number of moles of CO, H 2 and CH 3OH present are 0.160, and 0.180, respectively. Thermodynamic data are given below. CO(g) H 2(g) CH 3OH(g) Which one of the following statements applies to this equilibrium? A C The value of K p increases if the temperature is raised. The value of K p increases if the pressure is raised. The yield of methanol decreases if the temperature is lowered. The yield of methanol decreases if the pressure is lowered. Page 11

The partial pressure of sulphur dioxide in the equilibrium mixture was 24 kpa and the total pressure in the flask was 104 kpa.

The partial pressure of sulphur dioxide in the equilibrium mixture was 24 kpa and the total pressure in the flask was 104 kpa. Q1. Sulphur dioxide and oxygen were mixed in a 2:1 mol ratio and sealed in a flask with a catalyst. The following equilibrium was established at temperature T 1 2SO 2(g) + O 2(g) 2SO 3(g) ΔH = 196 kj mol