What is the approximate mass of air in a living room 4.5m*3.4m*2.9m? the density of air is 1.29 kg/m3?

First we have to calculate the volume of the living room:

V = L x W x H = 4.5 m * 3.4 m * 2.9 m

V = 44.37 m³

We know that Density = 1.29 kg/m²

D = m / V

m = D · V

m = 1.29 kg/m³ · 44.37 m³

m = 57.2373 kg ≈ 57.2 kg

Answer: The approximate mass of air in living room is 57.2 kg.