The Concentration of Ozone in Los Angeles Is 0

The concentration of ozone in Los Angeles is 0.67 ppm on a summer day. This means that if the total pressure is 735 torr, then the partial pressure of O₃ is _ torr.

A) 0.49
B) 1.1 × 10⁹
C) 4.9 × 10^{- 4}
D) 4.9 × 10²
E) 9.1 × 10²