chem
posted by Helpme .
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.
Respond to this Question
Similar Questions

Physics
A swimmer has 8.20 x 10^4 m^3 of air in his lungs when he dives into a lake. Assuming the pressure of the air is 95 percent of the external pressure at all times, what is the volume of the air at a depth of 10.0 m? 
chemistry
The density of air is 1.25 gram per liter determine the volume percentage of oxygen in the air at 1 atmospheric pressure and 27 degree celcius temprature? 
Physical Chemistry
What is the mass of air in a 250mL Erlenmeyer flask (actual volume is 267 mL) at a typical laboratory pressure of 715 torr and a temperature of 21˚C? 
Physics Classical Mechanics Help ASAP
In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a nonlinear … 
Classical mechanics
In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a nonlinear … 
PHYSICS(HELP!!!!!!!)
dT/dz=−α forz≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of … 
PHYSICS(HELP)
In the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a nonlinear … 
PHYSICS
n the lecture, we discussed the case of an isothermal atmosphere where the temperature is assumed to be constant. In reality, however, the temperature in the Earth's atmosphere is not uniform and can vary strongly and in a nonlinear … 
Physics, fluid mechanics
The temperature of earth atmosphere drops 5°C for every 1km elevation above the earth surface. If the air temperature at ground level is 15°C and 760 mmHg, determine the elevation in m when the pressure is 380 mmHg. Assume the air … 
engineering
An aircraft flies at an altitude of 30,000 feet. Determine the air temperature (in [K]), air pressure (in [Pa]) and air density (in [kg/m3]) at this altitude, according to the standard atmosphere.