Question

Please show all work.

The density of air at ordinary atmospheric pressure and 25 ∘C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 14.5 × 18.5 × 9.0ft?

Express your answer using two significant figures.

Answer 1

1 cubic ft = 28.3168 L

Volume = 14.5*18.5*9 ft^3
                 = 2414.25 ft^3
                 = 2414.25 * 28.3168 L
                 = 68363.9 L

density = mass / volume
1.19 g/L = mass / 68363.9 L
mass = 81353 g = 81 Kg

Answer: 81 Kg