The density of air at ordinary atmospheric pressure and 25 c is 1.19g/l. What is the mass in kg of the air in a room that measures 12.5 by 15.5 by 8.0 feet?

Question

please help me solve this problem.

Answer 1

Convert the units of feet into meters:

 

1 foot=12 inches, 1inch-2.54 cm, 100 cm=1m

 

12.5 feet*(12 inches/1foot)*(2.54 cm/1 inch)*(1 m/100 cm) or 3.81 m

 

15.5 feet*(12 inches/1foot)*(2.54 cm/1 inch)*(1 m/100 cm) or 4.72 m

 

8 feet*(12 inches/1foot)*(2.54 cm/1 inch)*(1 m/100 cm) or 2.43 m

 

Volume=3.81*4.72*2.43 or 43.7 m³

 

mass of air=1.19g/0.001 m³*43.7 or 52003 g

 

mass of air in kg=52003 g *(1 kg/1000 g) or 52 kg