7.33 The value of Kc for the reaction 3O2 (g) 2O3 (g) is 2.0 ×10–50 at 25°C. If the equilibrium concentration of O2 in air at 25°C is 1.6 ×10–2, what is the concentration of O3?

The given reaction is:

3O2g    2O3gThen, Kc=O3g2O2g3

It is given that 

 Kc=2.0×10-50 and O2g=1.6×10-2.

Then we have,

2.0×10-50=O3g21.6×10-23O3g2=2.0×10-50×1.6×10-23O3g2=8.192×10-56O3g=2.86×10-28 M

Hence, the concentration of  O3 is 2.86×10-28 M.