Gas Laws

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# Gas Laws - PowerPoint PPT Presentation

Gas Laws. Chemistry Mrs. Coyle. Factors Affecting Gas Pressure. Number of Moles (Amount of gas) As the number of particles increases, the number of collisions with the container wall increases. Volume The smaller the volume, the greater the pressure exerted on the container. Temperature

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## PowerPoint Slideshow about 'Gas Laws' - lydie

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Presentation Transcript

### Gas Laws

ChemistryMrs. Coyle

Factors Affecting Gas Pressure
• Number of Moles (Amount of gas)
• As the number of particles increases, the number of collisions with the container wall increases.
• Volume
• The smaller the volume, the greater the pressure exerted on the container.
• Temperature
• As temperature increases, kinetic energy increases, increasing the frequency of collision. Thus pressure increase.
Boyle’s Law

P1V1=P2V2 T constant

# moles constant

P vs V hyperbola

Isotherm

High Temp

P

V

Charles Law

V1 =V2 P constant

T1 T2 # Moles constant

Isobar

V

T (K)

Guy-Lussac

P1 = P2 V constant

T1 T2 # moles Constant

isochoric

P

T

Combined Gas Law

P1V1 = P2V2_

T1 T2

Ideal Gas Law: P V = n R T

P = pressure Pa = N/m2

V = volume measured in m3

n =# of moles

T = temperature K

R=Universal gas constant

=8.314 kPa L / (mol K)

=0.0821 L atm/(mol K)

=62.3 mmHg L/(mol K)

Dalton’s Law of Partial Pressures
• Ptot=P1+P2+….
• Total pressure of a mixture of gases in a container is the sum of the individual pressures (partial pressures) of each gas, as if each took up the total space alone.
• http://www.wwnorton.com/college/chemistry/gilbert/tutorials/interface.asp?chapter=chapter_08&folder=daltons_law
Ideal Gas Laws mostly hold at:
• Low pressure
• High temperature