What is the density of the air?

Question

Air, at sea level pressure and temperature, is such that 1 dm^3(=1000 cm^3) has a mass of 1.3g. what is the density of the air?

Answer 1

Density is mass/volume

mass = 1.3 g

volume = 1000 cm³

density = 1.3 g/1000 cm³ = 0.0013 g/cm³

or 1.3 g/dm³