Question

How much space does 1kg of air occupy? The density of the air is 0.0013g/mL

Answer 1

The basic relationship between mass m, volume V and density d is given by
$d= \frac{m}{V}$
re-arranging the equations and using m=1 kg and $d=0.0013 g/mL = 0.0013 kg/L$, we find the volume:
$V= \frac{m}{d}= \frac{1 kg}{0.0013 kg/L}=769.2 L$
and since $1 L = 1 m^3$, this corresponds to $769.2 m^3$ of air.