How do I solve this problem on equilibrium pressures?

Question

The following equilibrium pressures at a certain temperature were observed for the reaction:

 

2NO2 (g)<==>2NO (g)+O2

 

P (NO2)=0.55atm

P (NO)=6.5×10^-5 atm

P (O2)= 4.5×10^-5 atm

 

How do I calculate the value for the equilibrium  constant  K (p) at this temperature?

Answer 1

K = products/reactants

 

K = (ppNO)²(ppO₂)/(ppNO₂)²

where pp = partial pressure for the indicated gas.

Plug in the numbers and solve for K