A reaction vessel contains an equilibrium mixture of so2 o2

Question

A reaction vessel contains an equilibrium mixture of SO2, O2, and SO3. The reaction proceeds such that:

2SO₂ (g) + O₂ (g) = 2SO₃ (g)

The partial pressures at equilibrium are: 

PSO₂ = 0.001513 atm  

PO₂ = 0.001717 atm  

PSO3 ?= 0.0166 atm

Calculate KP for the reaction.