1. Ch. 13/14 Pt. 2
IDEAL GAS LAW

2. What is an Ideal Gas? P = pressure in atm or kPa V = volume in L
A gas that will behave according to the following equation:
PV = nRT
P = pressure in atm or kPa
V = volume in L
n = moles
R = ideal gas constant or 8.31
T = temperature in K
DEPENDS ON PRESSURE UNIT!

3. Ideal Gas Video
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4. Solving for ONE of the variables
Basic equation: PV = nRT
Solve for pressure: P = nRT Solve for volume: V = nRT
V P
Solve for moles: n = PV Solve for temperature: T = PV
RT nR

5. Learning Check
Use the ideal gas law PV = nRT to solve the following problem.
Q: How many mols of Helium could fit into a 0.5L bag at 50°C and 2atm?
First step: Identify all variables!
Second step: Which R do I use? Look at the P units! If atm:
If kPa: 8.31
Third step: Check that all units are correct;
P should be atm/kPa, V should be L, T should be K
Fourth step: Plug in all numbers and solve!
n = PV n = (2 x 0.5)/( x ) RT P V T
n = .037 mols of Helium