Gas Laws

Question 1

Graham’s Law of Effusion or Diffusion

• varies INVERSELY
• same temp. and pressure

Answer 1

R1/R2 = √M2/√M1

Question 2

Ideal Gas Law

Answer 2

PV=nRT

n= sample mass/molar mass

Question 3

Avogadro’s Principle
-number of moles is DIRECTLY related to volume
-equal volumes of gases at same temp. and pressure
must have equal number of moles

Answer 3

n1/v1 = n2/v2

Question 4

Gay-Lussac’s Law (definition)

Answer 4

The volumes of gases will react in small number whole ratios provided that the gases are at the same temp. and pressure.

Question 5

Standard Temperature

Answer 5

0° C or 273 Kelvin

Question 6

Standard Pressure

Answer 6

• 1 atmosphere
• 101.3 kPa
• 760 torrs
• 760 mmHg

Question 7

Ideal Gas

Answer 7

Does not exist. Ideal gas would obey the gas laws at all temperatures and pressures because it would not liquefy since it would have no attractive forces or volume.

Question 8

Boyle’s Law
-volume of a fixed mass varies INVERSELY with its pressure
at constant temp.

Answer 8

(P1)(V1) = (P2)(V2)

Question 9

Charles’ Law

-volume of a fixed mass of gas varies DIRECTLY with the Kelvin temperature if the pressure remains constant

Answer 9

V1/T1 = V2/T2

Question 10

Gay-Lussac’s Law

-pressure of gas varies DIRECTLY with Kelvin temperature if volume remains constant

Answer 10

P1/T1 = P2/T2

Question 11

Combination Gas Law

Answer 11

(P1)(V1)/T1 = (P2)(V2)/T2

Question 12

Dalton’s law of Partial Pressure

• “mixture”
• “over water”

Answer 12

P(total) = P(H20) + P(dry gas)