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At 0^@ C and 1.0 atm ( = 1.01 xx 10^5 N/...

At `0^@ C and 1.0 atm ( = 1.01 xx 10^5 N//m^2)` pressure the densities of air, oxygen and nitrogen are `1.284 kg//m^3, 1.429 kg//m^3 and 1.251 kg //m^3` respectively. Calculate the percentage of nitrogen in the air from these data, assuming only these two gases to be present.

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