Find the relative density of NO2 oxide by hydrogen and air

The relative density of one gas in another is the ratio of their molar masses, since, as a consequence of Avogadro’s law, equal volumes of gases contain the same number of molecules.

M (NO2) = 46

DH2 (NO2) = 46/2 = 23;

Dair (NO2) = 46/29 = 1.586.

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