## Chemistry (12th Edition)

$1.8\times10^{3} kilograms.$
Volume $=Length \times Width \times\,Height=25m\times15m\times4m=1500m^{3}$ So, mass of air in kilograms $=1500m^{3}\times\,1000\,Litre/m^{3}\times1.2\,grams/Litre=1800\times1000\,grams=1.8\times10^{3} Kilograms.$