Posted by **Helpme** on Friday, March 30, 2007 at 1:27am.

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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