1. Gas Laws

2. Animations of Basic Gas Laws
(animation with audio)

3. Boyle’s Law
V  1/P (T = constant )
Pressure  Volume = Constant
P1V1 = P2V2

4. Boyles Law

5. Charles’s Law
The volume of a gas is directly proportional to temperature, and extrapolates to zero at zero Kelvin.

6. Charles Law

7. b = proportionality constant T is always in Kelvin!!!
Charles’s Law
V  T (P = constant )
V = bT (P = constant)
b = proportionality constant
T is always in Kelvin!!!

8. Charles’s Law
P = constant

9. Avogadro’s Law
For a gas at constant temperature and pressure, the volume is directly proportional to the number of moles of gas.

10. a = proportionality constant V = volume of the gas
Avogadro’s Law
V  n (P and T = constant )
V = an
a = proportionality constant
V = volume of the gas
n = number of moles of gas

11. Ideal Gas Law An equation of state for a gas.
“state” is the condition of the gas at a given time.
PV = nRT

12. Ideal Gas Law PV = nRT R = proportionality constant
= L atm  mol
P = pressure in atm
V = volume in liters
n = moles
T = temperature in Kelvins

13. PV = nRT
Variables on the same side of the equation are inversely proportional
Variables on opposite sides of the equation are directly proportional

14. Standard Temperature and Pressure
“STP”
P = 1 atmosphere
T = C = 273K
The molar volume of an ideal gas is liters at STP

15. A balloon inflated in an air- conditioned room at 27oC, has a volume of 4 L. It is heated to a temperature of 57oC. What is the new volume of the balloon if the pressure remains constant

16. The gas left in an used aerosol can is at a pressure of 1 atm at 27oC
The gas left in an used aerosol can is at a pressure of 1 atm at 27oC. If this can is thrown unto a fire, what is the internal pressure of the gas when its temperature reaches 927oC

17. A container with an initial volume of 1 L is occupied by a gas at a pressure of 1.5 atm at 25oC. By changing the volume, the pressure of the gas increases to 6 atm as the temperature is raised to 100oC. What is the new volume?

18. A gas occupies a volume of 180 mL at 35. 0oC and 740 mm Hg
A gas occupies a volume of 180 mL at 35.0oC and 740 mm Hg. What is the volume of the gas at conditions of STP?