Chapter 6 2019/2020
Chapter 6 2019/2020
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a) Sulphur trioxide, SO3 gas decomposes sulphur dioxide and oxygen gas according to the following equation:
2 SO3 (g) ⇌ 2 SO2 (g) + O2 (g)
When 1.0 mol of SO3 is placed into a 2 L vessel and heated to 344K, the system achieves equilibrium and 0.6 mol SO3 gas remained.
i. Calculate the concentrations of each gas at equilibrium.
[5 Marks]
ii. Calculate the equilibrium constant Kc at 344K.
[2 Marks]
b) Phosphorus pentachloride, PCl5 is left in a sealed container to establish equilibrium.
PCl5 (g) ⇌ PCl3 (g) + Cl2 (g) ΔHo = -ve
i. Explain the effect of lowering temperature on the equilibrium constant, Kp of the system.
[2 Marks]
ii. Explain the effect of adding argon gas at constant volume on the equilibrium position.
[2 Marks]
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