The number density of the oxygen molecules for a pressure of 101,325 pa and temperature of 190K is 2.053g/L.
The density of an ideal gas can be calculated from the ideal gas law equation as follows:
PV = gRT/M
where;
- P = pressure
- V= volume
- T = temperature
- g = weight of the gas
- R = the ideal gas constant
- M = molecular mass
This equation may be rearranged to give the density of the gas :
r = g/V = PM/RT.
r = 101325 × 32/8.314 × 190
r = 2.053g/L