The density of air under ordinary conditions at 25 degrees * C is 1.19g / L. How many kilograms of air are in a room that measures 9.0ft * 11.0ft and has a 10.0 ft ceiling?

33.3 kg of air

Explanation:

This is a problem of conversion unit.

Density is mass / volume

Therefore we have to calculate the volume in the room, to be multiply by density. That answer will be the mass of air.

Volume of the room → 9 ft. 11 ft. 10 ft = 990 ft³

Density is in g/L, therefore we have to convert the ft³ to dm³ (1 dm³ = 1L)

990 ft³. 28.3 dm³ / 1ft³ = 28017 dm³ → 28017 L

This is the volume of the room, if we replace it in the density formula we can know the mass of air in g.

1.19 g/L = Mass of air / 28017 L

Mass of air = 28017 L. 1.19 g/L → 33340 g of air

Finally, let's convert the mass in g to kg → 33340 g. 1kg / 1000 g = 33.3 kg