ABSTRACT
Experiments show that 1 g mol of any dilute gas occupies the same molar volume
V0 = 2.24× 104 cm3 (5.1) at STP (standard temperature and pressure):
T0 = 273.15 K, P0 = 1 atm. (5.2)
From this we can obtain the gas constant R = P0V0/T0. The ratio of the molar volume to Avogadro’s number gives the density of any gas at STP:
Density = 2.70 × 1019 atoms/cm3. (5.3) This indicates the large number of atoms present in a macroscopic volume. We use the term “atom” here in a generic sense, to denote the smallest unit in the gas, which may in fact be a diatomic molecule such as H2.
