Molecular Geometry & Gas Laws

Question 0

Give the formula and definition for Charles’ Gas Law

Answer 0

V=KT; the volume of a confined gas is directly proportional to it’s absolute temperature, provided that the pressure remains constant.

Question 1

Give the formula and definition for Gay-Lussac’s Gas Law

Answer 1

P=KT; the pressure of a confined gas is directly proportional to it’s absolute temperature, provided the volume remains constant.

Question 2

Give the formula and definition for Boyle’s Gas Law

Answer 2

P=K/V; the pressure of a confined gas is inversely proportional to the volume, provided that the absolute temperature remains constant.

Question 3

How do you calculate the total pressure of a system?

Answer 3

Add all of the individual pressures.

Ex: Pt= Ph2o + Pn2 + Po2

Question 4

Explain the 5 basic postulates of the kinetic molecular theory

Answer 4

1) The particles are so small compared with the distances between them that the volume of the individual particles can be 0.
2) The particles are in constant motion.
3) Particles exert no force on each other.
4) Temp= EK (avg)
5) Collisions are perfectly elastic.

Question 5

What is an ideal gas?

Answer 5

A gas that strictly obeys Boyle’s Law (where K= 1)

Question 6

What is the molecular volume of any gas?

Answer 6

22.4 L

Question 7

What does STP stand for?

Answer 7

Standard Temperature and Pressure

Question 8

How do you convert degrees celcius to degrees kelvin?

Answer 8

Add 273.15

Question 9

What are STP conditions?

Answer 9

T= 0c = 273.15 K
P= 1atm= 101.3 kPa

Question 10

What is the combined gas law formula?

Answer 10

(P1V1)/ T1 = (P2V2)/ T2

Question 11

How would you find the volume of a gas given conditions:

• number of moles
• pressure (atm)
• degrees celcius
• R

Answer 11

PV= nRT

Question 12

What is absolute temperature measured in?

Answer 12

Kelvin

Question 13

How do you solve for the moles of a gas in STP?

Answer 13

(1 mol) / 22.4L = (x mol) /volume gas