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.

## Answer This Question

## Related Questions

- Physical Chemistry - What is the mass of air in a 250-mL Erlenmeyer flask (...
- Physics - A swimmer has 8.20 x 10^-4 m^3 of air in his lungs when he dives into ...
- chemistry - The density of air is 1.25 gram per liter determine the volume ...
- PHYSICS - n the lecture, we discussed the case of an isothermal atmosphere where...
- PHYSICS(HELP) - In the lecture, we discussed the case of an isothermal ...
- Physics Classical Mechanics Help ASAP - In the lecture, we discussed the case of...
- Classical mechanics - In the lecture, we discussed the case of an isothermal ...
- PHYSICS(HELP!!!!!!!) - dT/dz=−α forz≤11 km where α=6.5 K/...
- PHYSICS(HELP) - dT/dz=−α forz≤11 km where α=6.5 K/km (...
- PHYSICS URGENT - dT/dz=−α forz≤11 km where α=6.5 K/km (...

More Related Questions