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1. Write the equilibrium constant expression for the reaction   N2 (g) + 3 H2 (g)   D  ...

1. Write the equilibrium constant expression for the reaction   N2 (g) + 3 H2 (g)   D   2 NH3 (g)

2. For the reaction in question 1, delta H = -92 kj*mol^-1 Predict the direction of shift of the equilibrium of the above reaction caused by

adding N2 at constant volume and temperature

removing H2 at constant volume and temperature

adding N2 at constant volume and temperature

raising the temperature at constant total pressure

3. Hydrogen fluoride (HF) is a weak acid, which when dissolved in water reacts slightly by the equation HF (g) +   H2O (l)   D    H3O+ (aq) + F– (aq). Predict the direction of shift of the equilibrium that occurs if some NaOH is added to the solution. Explain.

4. Calcium fluoride (CaF2) is a sparingly soluble solid: CaF2 (s)    D    Ca2+ (aq) +   2 F– (aq). Predict whether CaF2 is more soluble in pure water or in water containing some HNO3. Explain in terms of shifts of equilibria. Hint: pay attention to your answer to question 3.

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