What is the weight of air in a room 16.5 ft long, 7.5 ft wide, and 8 ft high, if 10 ft3 of air weighs 27 lb?

First, determine the volume of the room by multiplying its dimensions such that,

Volume = Length x Width x Height

Substituting,

volume = (16.5 ft) (7.5 ft) (8 ft)

volume = 990 ft³

To determine the mass, we multiply the obtained volume by the density.

mass = (990 ft³) (27 lb / 10 ft³)

mass = 2673 lb

Answer: 2673 lb