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The composition of the atmosphere is approximately 80 per cent nitrogen and 20 per cent oxygen...

The composition of the atmosphere is approximately 80 per cent nitrogen and 20 per cent oxygen by mass. At what height above the surface of the Earth would the atmosphere become 90 per cent nitrogen and 10 per cent oxygen by mass? Assume that the temperature of the atmosphere is constant at 25oC. What is the pressure of the atmosphere at that height?
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Given, Initial concentrations Nitrogen 80% Oxygen-20% ow. By the hydrostatic equation, RT Since temperature is constant. Suppose at h hl The compositions is Nitrogen-9090 Oxygen= 10% 0 P1-90% PN2 + 10% P02 At NTP PN2 = 1.165 kg/m 3 Po2-1.331 kg/m3

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