Question

Calculate the relative density of carbon monoxide and carbon dioxide with respect to air.

(Molar mass of air is 29 g/mol)

Answer 1

Density is proportional to molar mass, assuming pressure and temperature remain constant. Therefore, since CO has a molar mass of 28 and CO2 has a molar mass of 44:
The relative density of CO vs air is 28/29 = 0.9655.
The relative density of CO2 vs air is 44/29 = 1.517.