The density of dry air at 20 degrees celsius is 1.20 g/l. what is the mass of air, in kilograms, of a room that measures 24.0m by 15.0 m by 4.0 m

1728 kg is the mass of air for the room

Explanation:

An exercise of unit conversion.

The volume of the room will be:

24 m . 15 m . 4m = 1440 m³

Density of air is 1.20 g/L which means that in 1L, there is contained 1.20 g of air.

1L = 1dm³

1m³ = 1000 dm³

1440 m³ . 1000 = 1440000 dm³ ⇒ 1.44x10⁶ L

Density of air = 1.20 g/L = mass of air / volume of air

1.20 g/L = mass of air / 1.44x10⁶ L

1.20 g/L  . 1.44x10⁶ L = mass of air →  1728000 grams

1 g = 1x10⁻³ kg

1728000 g / 1000 = 1728 kg