CH1012
L1 /
‹#›
L1 /
2
REAL GASES
REAL GASES
(i) at low p & high T » ideal gas (eg. 1atm, 25oC)
(i) at low p & high T » ideal gas (eg. 1atm, 25oC)
(ii) high p & / or low T 2 types of
deviations:
1) Total
volume of particles is not negligible
container volume V > than the
free volume
available to the gas molecules
available to the gas molecules
pV/RT > 1 at high p (1 mol of gas)
N2 p = 500atm, 300K pV/RT = 1.4 Videal0.05 Vmeas 0.07dm3
N2 p = 500atm, 300K pV/RT = 1.4 Videal0.05 Vmeas 0.07dm3
2)
Intermolecular
attractive forces are not
negligible - lowers pressure p
pV/RT < 1 at low T (1 mol of gas)
N2 V = 1m3, 100K pV/RT = 0.7 pideal831 pmeas 582Pa
N2 V = 1m3, 100K pV/RT = 0.7 pideal831 pmeas 582Pa
