What is the approximate mass of air in a living room 5.6 m x 3.6 m x 2.4 m?

Answer 1

It depends on the density of air, which is about 1.225 g/L at sea level and 15°C (Wiki)

Volume of room
V=5.6*3.6*2.4 m³
=48.384 m³
=48.384 m³ *1000 L/m³

Multiply volume and density
mass=volume*density
=48.384*1000 L * 1.225 g/L
=48.384*1000*1.225 g

Use your calculator to finish the calculation.

Answer 2

5927.04