• II. Charles’s Law• A. relationship between volume and

temperature• 1. T and V directly proportional (if P held

constant) • 2. the T of gases is examined in the Kelvin scale

(because there are no negative numbers and 0 K is a theoretical value)

• 3. 0 K is called absolute zero – • a. to convert from Celsius to Kelvin, add 273• B. Formula is- V1/T1 = V2/T2• Ex. A gas sample at 40.0o C occupies a volume of

2.32 L. If the temperature is raised to75.0o C , what will the volume be, assuming pressure remains constant?

• * Change T to Kelvin

• III. Gay-Lussac’s Law• A. relationship between P and T• B. P and T are directly proportional (at

constant V)• 1. T must be in kelvin• C. Formula is: P1/T1 = P2/T2• Ex. The pressure of a gas in a tank is 3.20 atm

at 22o C. If the temperature rises to 60.0 o C, what will be the gas pressure in the tank?

• * change T to Kelvin