Answer :
The partial pressure of CO(Carbon Monoxide) in the air sample is found to be 4.3 x 10⁻³ torr.
The molar proportion of CO times the total pressure gives you the partial pressure of CO.
The new query is thus, "Why is the molar fraction assumed to have the same ppm concentration?" This is because the parts in this situation are moles, which is what the term "parts per million" refers to (usually it is grams, but it is not the case, given the result).
Since 695 x 6.2 x 10⁻⁶ = 0.004309 = 4.309 x 10⁻³ = 4.3 x 10⁻³, this is the reason.
The formula used above to multiply the total pressure and determine the partial pressure of CO is 6.2 ppm = 6.2 / 1,000,000 = 6.2*10-6.
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