How many air molecules are in a 15.0×12.0×10.0 ft room? Assume atmospheric pressure of 1.00 atm, a room temperature of 20.0 ∘C, and ideal behavior.

Volume conversion:There are 28.2 liters in one cubic foot.

1 answer

just plug in your formula

PV = nRT
n = PV/RT

n is the number of moles.
Now multiply by A, Avogadro's constant to get the number of molecules.

Or, since R = kA,

n = PV/kAT so

nA = PV/kT

gives the number of molecules