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Chemistry
9th -
12thgrade
3.1.10 Equilibrium constant (A-level only)
13 questions
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- 1. Multiple Choice
An equilibrium mixture is prepared in a container of fixed volume.
CO(g) + Cl2(g) ⇌ COCl2(g)
ΔH = −108 kJ mol−1
The temperature of this mixture is decreased and the mixture is allowed to reach a new equilibrium.
Which is greater for the new equilibrium than for the original equilibrium?
The mole fraction of carbon monoxide
The partial pressure of chlorine
The total pressure of the mixture
The value of the equilibrium constant, Kp
- 2. Multiple Choice
Which statement about Kp is correct for this reaction in the gas phase?
W + X + Y2 ⇌ WXY + Y
ΔH = −46 kJ mol−1
The value of Kp is independent of pressure.
The value of Kp increases as pressure increases.
The value of Kp increases as temperature increases.
The value of Kp is independent of temperature.
- 3. Multiple Choice
Which change would alter the value of the equilibrium constant (Kp) for this reaction?
2SO2(g) + O2(g) ⇌ 2SO3(g)
Increasing the total pressure of the system.
Increasing the concentration of sulfur trioxide.
Increasing the concentration of sulfur dioxide.
Increasing the temperature
- 4. Multiple Choice
This question is about the reaction given below.
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
Enthalpy data for the reacting species are given in the table below.
Which one of the following statements is not correct?
The value of Kp 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.
- 5. Multiple Choice
The equation for the combustion of butane in oxygen is
C4H10 + 6.5O2 → 4CO2 + 5H2O
The mole fraction of butane in a mixture of butane and oxygen with the minimum amount of oxygen required for complete combustion is
0.133
0.153
0.167
0.200
- 6. Multiple Choice
This question relates to the equilibrium gas-phase synthesis of sulphur trioxide:
2SO2(g) + O2(g) ⇌ 2SO3(g)
Thermodynamic data for the components of this equilibrium are given.
This equilibrium, at a temperature of 585 K and a total pressure of 540 kPa, occurs in a vessel of volume 1.80 dm3. At equilibrium, the vessel contains 0.0500 mol of SO2(g), 0.0800 mol of O2(g) and 0.0700 mol of SO3(g).
The mole fraction of SO3 in the equilibrium mixture is
0.250
0.350
0.440
0.700
- 7. Multiple Choice
This question relates to the equilibrium gas-phase synthesis of sulphur trioxide:
2SO2(g) + O2(g) ⇌ 2SO3(g)
Thermodynamic data for the components of this equilibrium are given.
This equilibrium, at a temperature of 585 K and a total pressure of 540 kPa, occurs in a vessel of volume 1.80 dm3. At equilibrium, the vessel contains 0.0500 mol of SO2(g), 0.0800 mol of O2(g) and 0.0700 mol of SO3(g).
With pressures expressed in MPa units, the value of the equilibrium constant, Kp, is
4.90
6.48
9.07
16.8
- 8. Multiple Choice
This question relates to the equilibrium gas-phase synthesis of sulphur trioxide:
2SO2(g) + O2(g) ⇌ 2SO3(g)
Thermodynamic data for the components of this equilibrium are given.
This equilibrium, at a temperature of 585 K and a total pressure of 540 kPa, occurs in a vessel of volume 1.80 dm3. At equilibrium, the vessel contains 0.0500 mol of SO2(g), 0.0800 mol of O2(g) and 0.0700 mol of SO3(g).
Possible units for the equilibrium constant Kp include
no units
kPa
Mpa−1
kPa−2
- 9. Multiple Choice
This question relates to the equilibrium gas-phase synthesis of sulphur trioxide:
2SO2(g) + O2(g) ⇌ 2SO3(g)
Thermodynamic data for the components of this equilibrium are given.
This equilibrium, at a temperature of 585 K and a total pressure of 540 kPa, occurs in a vessel of volume 1.80 dm3. At equilibrium, the vessel contains 0.0500 mol of SO2(g), 0.0800 mol of O2(g) and 0.0700 mol of SO3(g).
At equilibrium in the same vessel of volume 1.80 dm3 under altered conditions, the reaction mixture contains 0.0700 mol of SO3(g), 0.0500 mol of SO2(g) and 0.0900 mol of O2(g) at a total pressure of 623 kPa. The temperature in the equilibrium vessel is
307 °C
596 K
337 °C
642 K
- 10. Multiple Choice
The following information concerns the equilibrium gas-phase synthesis of methanol.
CO(g) + 2H2(g) ⇌ CH3OH(g)
At equilibrium, when the temperature is 68 °C, the total pressure is 1.70 MPa.The number of moles of CO, H2 and CH3OH present are 0.160, 0.320 and 0.180, respectively. Thermodynamic data are given.
Possible units for the equilibrium constant, Kp, for this reaction are
no units
kPa
MPa−1
kPa−2
- 11. Multiple Choice
The following information concerns the equilibrium gas-phase synthesis of methanol.
CO(g) + 2H2(g) ⇌ CH3OH(g)
At equilibrium, when the temperature is 68 °C, the total pressure is 1.70 MPa.The number of moles of CO, H2 and CH3OH present are 0.160, 0.320 and 0.180, respectively. Thermodynamic data are given.
The mole fraction of hydrogen in the equilibrium mixture is
0.242
0.485
0.653
0.970
- 12. Multiple Choice
The following information concerns the equilibrium gas-phase synthesis of methanol.
CO(g) + 2H2(g) ⇌ CH3OH(g)
At equilibrium, when the temperature is 68 °C, the total pressure is 1.70 MPa.The number of moles of CO, H2 and CH3OH present are 0.160, 0.320 and 0.180, respectively. Thermodynamic data are given.
With pressures expressed in MPa units, the value of the equilibrium constant, Kp, under these conditions is
1.37
1.66
2.82
4.80
- 13. Multiple Choice
The following information concerns the equilibrium gas-phase synthesis of methanol.
CO(g) + 2H2(g) ⇌ CH3OH(g)
At equilibrium, when the temperature is 68 °C, the total pressure is 1.70 MPa.The number of moles of CO, H2 and CH3OH present are 0.160, 0.320 and 0.180, respectively. Thermodynamic data are given.
Which one of the following statements applies to this equilibrium?
The value of Kp increases if the temperature is raised.
The value of Kp 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.
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