Question
Tue May 08, 2012 By:

THE DENSITY OF MIXTURE OF NITROGEN AND OXYGEN IS 1.15g/L AT 750 mm OF Hg AT 300 K.CALCULATE THE PERCENTAGE COMPOSITION OF THESE GASES IN THE MIXTURE.ASSUME THE GASES BEHAVE IDEALLY.

Expert Reply
Tue June 19, 2012
PV = n RT= (m/M) RT
M= dRT /P
=1.15 x .0821 x 300/ 750 /760 = 28.7gmol-1
Let w1 be the mass fraction of N2 ans 1- w2 is the mass fraction of O2
so w1 X28 + (1- w1 )X 32 = 28.7
w1 = 0.825
% compostion of N2 = 82.5 %
% composition of O2 = 17.5 %
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