Step-by-step explanation:
It is known that density is amount of mass present in per unit volume of the substance.
Mathematically, Density = 

It is given that mass is 
 and density is 1.29 g/L.
 and density is 1.29 g/L.
Therefore, calculate the volume by putting the given values into the above formula as follows.
 Density = 

 1.29 g/L = 

 volume = 489.92 L
Thus, we can conclude that volume of the air is 489.92 L.