1. The Ideal Gas Law

2. Ideal Gas
Real Gas
Made of small particles that have mass
Same
Mostly Empty Space
Low density
Particles are in constant motion
No attractive or repulsive forces between particles
Small attractive or repulsive forces between particles
Particles have no volume
Particles have small volume
Collision are elastic (lose no KE)
Collision are NOT elastic (lose KE)

3. P1 x V1 = P2 x V2 = R
n1 x T n1 x T2

5. Standard Temperature and Pressure

6. The conditions 0 0C and 1 atm are called standard temperature and pressure (STP).
Experiments show that at STP, 1 mole of an ideal gas occupies L.

7. What is the volume (in liters) occupied by 49.8 g of HCl at STP?

8. Calculate the pressure in atmospheres of 0
Calculate the pressure in atmospheres of mol of He at 16°C & occupying L.

9. Find the volume of 85 g of O2 at 25°C and 104.5 kPa.

10. Example
A gas sample occupies a volume of L at 38°C and atm. What will be the temperature of the sample if it occupies L at 1.25 atm?

11. Example
A sample of nitrogen gas in a 2.00 L container has a pressure of mmHg at 25°C. What would be the pressure on the sample in a 1.00 L container at 125°C?

12. Example
The gas pressure in an aerosol can is 1.5 atm at 25 oC. Assuming that the gas inside obeys the ideal-gas equation, what would the pressure be if the can were heated to 450 oC?

13. What volume does 48. 0 g of methane, CH4, occupy at 140
What volume does 48.0 g of methane, CH4, occupy at 140. oC under a pressure of 1280 torr?

14. A 250. mL flask contains a mixture of nitrogen, oxygen, and helium at a temperature of 27 oC and a pressure of atm. How many moles of gas are present?

15. What pressure in kilopascals is exerted by 0
What pressure in kilopascals is exerted by g of carbon dioxide in a 1.00 L flask at 100 oC?

16. What is the volume of a 15. 0-g sample of neon gas at 130
What is the volume of a 15.0-g sample of neon gas at kPa and 39°C?

17. At what temperature will 2
At what temperature will 2.85 moles of hydrogen gas occupy a volume of 0.58 L at 1.00 atm?