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Lecture 3

CHEM 102 Lecture 3: The Gas Laws

2 Pages
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Department
Chemistry
Course Code
CHEM 102
Professor
Irina Paci

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8.3 The Gas Laws
Chem 102
January 10, 2017
Physical state of a gas is define by four variables:
Temperature, T
Pressure, P
Volume, V
Number of moles, n
The Gas laws express the relationship between these variables.
Boyle’s Law: The Pressure – Volume Relationship:
The volume of a fixed quantity of an ideal gas at constant temperature is
inversely proportional to pressure.
PV = k
Or
P1V1 = P2V2
NOTE:
When graphed, Pressure vs. Volume is a hyperbola where as Pressure-1 vs.
Volume is linear.
Charles Law: Temperature Volume Relationship
The volume of a fixed quantity of an ideal gas at constant pressure is directly
proportional to the temperature (Kelvin).
Holding n and P constant:
 
Or
 
Volume and Temperature are only directly proportional when temperature is in Kelvin.
If the positive °C of a confined gas is doubled at constant pressure the volume of a gas
does what?
Increases by a factor of 

Avogadro’s Law: The Quantity Volume Relationship
The volume of an ideal gas at constant pressure and temperature is directly
proportional the moles of a gas.
When temperature and pressure are constant:
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Description
8.3 The Gas Laws Chem 102 January 10, 2017 Physical state of a gas is define by four variables: Temperature, T Pressure, P Volume, V Number of moles, n The Gas laws express the relationship between these variables. Boyle’s Law: The Pressure – Volume Relationship: The volume of a fixed quantity of an ideal gas at constant temperature is inversely proportional to pressure. PV = k Or P 1 1 P V2 2 NOTE: -1 When graphed, Pressure vs. Volume is a hyperbola where
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