3. Gay-Lussac’s Law
Joseph Louis Gay-Lussac in
1802 made reference in his paper to
unpublished work done by Jacques
Charles. Charles had found that
oxygen, nitrogen, hydrogen, carbon
dioxide, and plain air expand to the
same extent over the same 800
4.
5. Gay-Lussac’s law:
The volume of a sample of gas at
constant
pressure will vary directly with
temperature.
Temperature & pressure
–As P then T Remember all Temperatures must be in KELVIN
P1 = T1
P2 T2
6. 1. A 3.00 L flask of oxygen gas
has a pressure of 115 kPa at a
temperature of 35.0°C (308
K). What is the pressure when
the temperature is raised to
100°C (373 K)?
SAMPLE PROBLEMS
7. 2.
2. A gas collecting tube
held hydrogen gas at 0.995
atm and 25.0°C (298 K).
is the temperature of the
gas if the pressure in the
tube is 0.845 atm?
8. 3. A tank was pumped full of
air at a temperature of 40.0°C
(313 K). What was the original
pressure if the pressure in the
tank is 260 kPa when the
temperature is lowered to -
10.0°C (263 K)?
9. 4. A tank held nitrogen gas at
784 mm Hg . When the
temperature of the flask is set
at 57.0°C (330 K), the pressure
is 642 mm Hg. What was the
original temperature of the
tank?
10. 5. Determine the
pressure change when a
constant volume of a gas
at 1.00 atm is heated
from 20 0C to 10 0C.
11. 6. A gas has a
pressure of 0.37 atm
at 50 0C. What is the
pressure at standard
temperature?
12. EVALUATION
Direction: Choose the letter of the best answer.
Records show that the incident of tire explosion is high
during summer season.
1. Which of the following gives the best explanation for
this observation?
A. There are more travelers during summer vacation.
B. High temperature during summer season causes air
inside the tire to expand.
C. Vehicles tire are not well maintained.
D. There is too much air inside the tire.
13. 2. Which is most likely to happen when a closed
vessel filled with gas is shaken for two
minutes?
A. The temperature inside the vessel increases.
B. The pressure inside the vessel increases.
C. The temperature and pressure inside the
vessel decreases.
D. Both the temperature and pressure inside
the vessel increases.
14. 3. Determine what will happen to the
temperature of a confined gas as the
pressure decreases.
A. The gas temperature stays the
same.
B. The gas temperature decreases
C. The gas temperature increases
D. There is NO enough data
15. 4. Which correctly describes the
relationship of pressure and
temperature of a gas at constant
volume?
A. Directly proportional
B. Inversely proportional
C. undetermined
D. no relationship
16. REFERENCES
• APEX Chemistry Unit 2
• Chapter 3: Gases: The Fastest-Moving Particles
• Chang, Raymond, (1998).Chemistry.6thEdition.Mc Graw-Hill
Companies, Inc.
• Science & Technology III by: Cerna, et al
pp. 98 - 99
• http://www.physiscscentral.com
Editor's Notes
Firing a bullet. When a gun powder’s burns it creates a large amount of superheated gas. The high pressure of a hot gas behind the bullet forces it out of the barrel of the gun.
B. High temperature during summer season causes air inside the tire to expand.
D. Both the temperature and pressure inside the vessel increases.
