given an atmospheric pressure of 750mm Hg, find the partial pressures of nitrogen, oxygen. carbon dioxide and argon

Do you have the volume percents of O2, N2, CO2, and Ar listed? If not look them up on Google, then

%O2 x 750 = ?
%N2 x 750 = ?
%CO2 x 750 = ?
%Ar x 750 = ?