the molecular mass of a gas is the sum of the masses of all the atoms that make up a molecule of that gas.
the ideal gas equation is pV = nRT where p is the pressure, V is the volume, n is the moles in a gas, R is the molar gas constant and T is the temperature. R is measured in j/mol/K
one mole of any gas is 6.02x10-23 particles (avogadro's constant)
the molar mass of a gas is the mass of one mole of that gas at a fixed temperature and pressure
apart from ideal gases the ideal gas equation works well for gases at low pressures and high temperatures
boltzmann's constant is equal to R(molar gas constant)/Na(avogadros consant)
what is Boltzmann's constant?
the gas constant for one particle of gas - 1.38x10-23j/k
what is the equation of state of an ideal gas ?
pV = NkT
the molar mass of a substance is equal to the relative atomic mass of the substance