1. Ideal Gas Law

2. PV = nRT PV = nRT Ideal Gas Law (P)ressure in kPa (V)olume in L
n = # of mol
R = 8.31
(T)emp in K
PV = nRT
(P)ressure in atm
(V)olume in L
n = # of mol
R = .0821
(T)emp in K

3. Practice
A gas has a volume of mL at a temp of 28oC and a pressure of 82.6kPa.
How many moles of gas are in the sample?
If the gas is chlorine, what is the mass of the sample?

4. V = 31200.0mL = 31.2 L T = 28oC + 273 = 301K P = 82.6kPa R = 8.31
n = ?
PV = nRT
(82.6)(31.2L) = n (8.31) (301K)
n = 1.03 moles
1.03 moles Cl2 = 72.1g Cl2

5. V = mL = L
T = 28oC = 301K
P = 82.6kPa/ 101.3kPa = 0.815atm
R =
n = ?
PV = nRT
(0.815)(31.2L) = n (0.0821) (301K)
n = 1.03 moles
1.03 moles Cl2 = 72.1 g Cl2

6. The End