The mass of 1 liter of nitrogen under normal conditions is 1.251 g. Calculate the density of nitrogen from hydrogen.

Under normal conditions, 1 mole of any gas occupies a molar Vm = 22.4 l / mol. Determine the number of moles of nitrogen:
v = V / Vm, where V is the volume of nitrogen (1 l).
v = 1 / 22.4 = 0.0446 mol.
Relative molecular weight of nitrogen: Mr = m / v, where m is the weight of nitrogen (m = 1.251 g). Mr = 1.251 / 0.0446 = 28 g / mol.
Relative density for hydrogen:
D (H2) = Мr (N2) / Мr (Н2), where Мr (Н2) is the relative molecular weight of hydrogen (Мr (Н2) = 2 g / mol).
D (H2) = 28/2 = 14.
Answer. The relative density of nitrogen in terms of hydrogen is 14.