• Density is defined as the mass per unit volume of a substance.
  • Since gases all occupy the same volume on a per mole basis, the density of a particular gas is dependent on its molar mass.
  • Molar mass divided by molar volume yields the gas density at STP.
  • Gas densities are typically reported in g/L.
  • Gas density can be calculated from molarMass and molarVolume.
  • The density of nitrogen is slightly larger than molarvolume, so the density is slightly greater than 1 g/l.
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