The Concentration of Ozone in a Sample of Air That

The concentration of ozone in a sample of air that has a partial pressure of O₃ of 0.33 torr and a total pressure of air of 735 torr is __________ ppm.

A) 4.5 × 10²
B) 0.45
C) 0.045
D) 2.2 × 10^-3
E) 2.2