Question

Air contains nitrogen and oxygen in the volume ratio of 4 : 1 the average relative density of air is

Answer 1

OK
Molecular weight of N2 ~ 14x2 => 28
Molecular weight of O2 ~ 16x2 => 32

0.8*28 + 0.2*32 => 28.8

Relative to H2 (~2), this is
28.8 / 2 => 14.4

Answer 2

Answer:

the average molecular weight is=28.8