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Air contains 79 % N2 and 21 % O2 by volume. If the barometric pressure is 750 mm Hg, the partial pressure of oxygen is
NOTE- for gaseous mixture volume percentage is same as mole percentageand mole % is called fractionso mole fraction of O2 in air =0.2TOTAL Pressure of air=environment pressure=1atmmultiply it by total pressure you get partial pressure of O2=0.2*1=0.2
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