**Chapter 12 Gas Laws**

**Chloe Hafner**

Gunindu Abeysekera

Gunindu Abeysekera

Boyle's Law

Volume

Pressure (kPa)

**P**

**V**

Boyle's Example

Remember: P1 x V1 = P2 x V2

The volume of a balloon is 2L; it contains 60 atm of helium pressure in it. What would be the volume of the balloon if the pressure increases to 75 atm?

Charles' Example

V1

T1

=

V2

T2

Remember:

A balloon is filled with 2L of helium and is in an current environment at 283K, when Charles and Carl arrive in Antarctica, they notice the temperature decrease to 253K, also noticing the balloon deflate. What is the NEW volume of the deflated balloon?

Charles' Law

Volume

Temperature (K)

P

V

Gay-Lusaac's Example

The pressure of a balloon is 60 atm and is currently in

an environment at 348K, but when Gay-Lusaac and Carl

arrive in the Sahara desert, the temperature increases to

373K, what is the NEW pressure?

Remember:

P1

T1

=

P2

T2

Gay-Lusaac's Law

Temperature (K)

Pressure

P

V

Dalton’s Law of

Partial Pressures

Calculation of a mixture of gases when the pressure and temperature are constant

Equation: (Just add the pressures of the reactants used)

P(total) = P1 + P2 + P3...

Dalton’s Law of Partial Pressures

Example

The air inside Carl's house is filled with _____ kPa of

helium, 50 kPa of oxygen, and 70 kPa of nitrogen. The total pressure is 150 kPa. What is the partial pressure of helium?

Graham's Laws

tendency of molecules to move from areas of high concentration to areas of low concentration, balancing the concentrations.

Diffusion:

Effusion:

process in which a gas escapes through a tiny hole in a container.

Graham's Law of Effusion/Diffusion

The rate of effusion

of a gas is inversely proportional to to

the square root of a gas' molar mass.

Gases with lower molar mass move faster than gases with higher molar mass.

A balloon filled with helium deflates faster than one filled with air.

Rate A

Rate B

=

Molar Mass B

Molar Mass A

Graham's Example

Remember:

Rate A

Rate B

=

Molar Mass B

Molar Mass A

Compare the rates of effusion of:

Oxyegn (A)

Helium (B)