A sample of iron(II) sulfate was heated in an evacuated container to 920 K, where the following reactions occurred.

Reaction (a) : 2FeSO₄(s) → Fe₂O₃(s) + SO₃(g) + SO₂(g).
Reaction (b) : SO₃(g) → SO₂(g) + 1/2 O₂(g).

After equilibrium was reached, the total pressure was 0.836 and the partial pressure of oxygen was 0.0275 atm. Calculate Kₚ for each of these reactions.