# How many moles of gas occupy 22.4 liters at 27 Celsius degrees and 0.50 atm of pressure?

Jul 15, 2014

Thanks for the gas law question.

In order to solve this problem, we can use the Ideal Gas Law.

PV = nRT

Pressure needs to be in atmospheres (.50 atm)
Volume needs to be in liters (22.4 L)
n is the number of moles (and your unknown in this particular question)
R is the universal gas constant (R = .08206 $L \cdot a t m$L/$m o l \cdot K$)
T is the temperature in K (oC + 273 = K, so 27oC + 273 = 300. K)

(.50 atm) ( 22.4 L) = n (.08206 $L \cdot a t m$/$m o l \cdot K$) (300. K)