Given an atmostpheric pressure of 750mm Hg, find the partial pressures of nitrogen, oxygen, carbon dioxide..?

Question

given an atmostpheric pressure of 750mm Hg, find the partial pressures of nitrogen, oxygen, carbon dioxide and argon n dry air.

Answer 1

You need the makeup of air in percent mass. Divide all by molar masses to get mole fractions. They will all add to a total of 1. multiply each by 750mmhg and you will have the partial pressures. They will all add to total 750 in the end. :)