Write the equilibrium constant expressions for the reactions:

A. C₃H₈ (g)+ 5O₂ (g) ➞ 3CO₂ (g) + 4H₂O (g)

B. 3O₂ (g) ➞ 2O₃ (g)

C. 2SO₂ (g) + O₂ (g) ➞ 2SO₃ (g)

D. HF (g) ➞ H⁺¹ (aq) + F^-1 (aq)