not sure how to do this

Question

Given the air in a building has a density of 1.184x10^-3 g*cm^-3, how much does the air weigh(in pounds) in a room measuring 30.0 ft and 7.0 in wide by 41.0 ft long by 9.00 ft high?

Answer 1

First, find the volume of the room, in cubic centimeters.  You'll need to change each of L, W and H measurements of the room (assumed to be a 'rectangular solid') by using 1 ft = 12 inches & 1 inch = 2.54 cm.)

 

This volume (cm cubed) needs, then, to be multiplied by the density; that product will be a number of grams. 

 

Lastly, you'll need to have a conversion from grams to lbs.  Perhaps you already have this fact, or Google it.