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At 0C and 1 atm pressure the densities of air, oxygen and nitrogen are 1.293, 1.429 and 1.251 kg/m3. Calculate the percentage of nitrogen in air, assuming only these two gases to be present.
PV=nRT
P(N)+P(O)=1 atm
P(N)=n(N)RT/V
P(O)=n(O)RT/V
n=PV/RT
nM/V=PM/RT=density
nM=PVM/RT=mass
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