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chem

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Forty miles above the earth's surface the temperature is 250 K and the pressure is only 0.20 mm Hg. What is the density of air (in grams per liter) at this altitude? (Assume the molar mass of air is 28.96 g/mol.)

PV=nRT
n/V= molar desity= P/RT
mass density= molar density*molmass
= P*(molmass)/RT

Watch your units.

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