1. Warm-Up: To be turned in
Consider the following three containers filled with the same gas at the indicated pressures: If all three containers have the same volume and are at the same temperature, which has the most molecules? Explain your answer.
1atm
2atm
3 atm

2. Gay-Lussac’s Law

3. Joseph-Louis Gay-Lussac
French chemist and physicist
Pioneered investigations into the behavior of gases

4. Gay-Lussac’s Law
At constant volume, pressure and temperature are directly related.
As one goes up, so does the other one
Can be explained with kinetic molecular theory.
As temperature increases, the molecules moves faster, leading to more collisions against the container, increasing pressure.

5. P1 = P2 T1 T2 P1= initial pressure T1= initial temperature*
P2= final pressure
T2= final temperature*
*temperature must be in Kelvin scale!
K= °C+273

6. A gas in an aerosol can is at a pressure of 3. 00atm at 25°C
A gas in an aerosol can is at a pressure of 3.00atm at 25°C. What would the pressure be if the temperature was raised to 52°C?
P1 = P2 T1 T2
3.00 = P
975 = 298P2
3.27atm= P2

7. Before a trip from New York to Boston, the pressure in an automobile tire is 1.8 atm at 20.°C. At the end of the trip, the pressure gauge reads 1.9 atm. What is the new temperature of the air inside the tire?
P1 = P2 T1 T2
1.8 = T2
556.7 = 1.8T2
309K= T2

8. At 120. °C, the pressure of a sample of nitrogen is 1. 07 atm
At 120.°C, the pressure of a sample of nitrogen is 1.07 atm. What will the pressure be at 205°C, assuming constant volume?
P1 = P2 T1 T2
1.07 = P
= 393P2
1.30atm= P2