A sample of air from a home is found to contain 6.2 ppm of carbon monoxide.This means that if the total pressure is 695 torr,then the partial pressure of CO is ________ torr.

Question

Quizplus · Accepted Answer

ppm (parts per million) is a unit of concentration. 6.2 ppm means there are 6.2 parts of CO for every 1,000,000 parts of air. Therefore, the partial pressure of CO is equal to the total pressure of air in the sample multiplied by the concentration of CO in ppm.

Partial pressure of CO = total pressure x (concentration of CO / 1,000,000)

Partial pressure of CO = 695 torr x (6.2 / 1,000,000)

Partial pressure of CO = 4.3 x 10^-3 torr

Therefore, the answer is choice B).

A Sample of Air from a Home Is Found to Contain