TOPICS1. Intermolecular Forces2. Properties of Gases3. Pressure4. Gas Laws – Boyle, Charles, Lussac 5. Ideal Gas Law6. Gas Stoichiometry7. Partial Pressure8. Kinetic Molecular Theory9. Effusion & Diffusion10. Real Gases

IMPORTANT CONCEPTS5.1• Pressure• Units for pressure• STP

5.2• Boyle• Charles• Lussac• Avogadro

5.3• Ideal Gas Law

5.4• Gas Stoichiometry• Gas density•Molar mass

5.5 • Partial Pressure• Collecting gas

5.6• Kinetic Molecular Theory

5.7 • Effusion • Diffusion

5.8 & 5.9• Real gases

5.4 IDEAL GAS LAWOBJECTIVE: Combining the Gas

Laws

5.4 IDEAL GAS LAW

PV = nRTP = pressureV = volumen = # of mol

T = temperature in KELVIN

Ideal Gas Law can be used to

1. Calculate density of a gas2. Find molar mass & formula of an unknown gas

5.4 IDEAL GAS LAW

PV = nRT

n = moles

PV = mass RT molar mass

moles = mass molar mass

substitute above for “n”

5.4 IDEAL GAS LAW Ideal Gas Law can be used to

1. Calculate density of a gas

PV = mass RT molar mass

P (molar mass) = mass

RT volume

density = mass volume

rearrange IGL to havemass

volume

5.4 IDEAL GAS LAW Ideal Gas Law can be used to

1. Calculate density of a gas

P (molar mass) = mass

RT volume

units for density = g/L

Calculate the density ofcarbon dioxide

in grams/L at 0.990 atm

and 55 C

5.4 IDEAL GAS LAW Ideal Gas Law can be used to

1. Calculate density of a gas

P (molar mass) = mass

RT volume

units for density = g/L

What is the density in g/L of UF6 at

779 mm Hg and 62 C

R = 62.4

5.4 IDEAL GAS LAW Ideal Gas Law can be used to

1. Calculate density of a gas

Ideal Gas Law can be used to

1. Calculate density of a gas2. Find molar mass & formula of an unknown gas

5.4 IDEAL GAS LAW

PV = mass RT molar mass

molar mass = mass RT

PV

molar mass = density RT

P

units = g/mol

A chemist synthesized a greenis-yellow gas ofchlorine and oxygen,

and found that itsdensity is 7.71 g/L at 36

C and 2.88 atm

What is the molar mass and molecular formula?

5.4 IDEAL GAS LAW Ideal Gas Law can be used to 2. Find molar mass & formula of an unknown gas

GASES

1. How many moles of gases are contained in a can with a volume of 555mL and a pressure of 600.0 kPa at 25C?

2. Calculate the pressure exerted by 43 mol of nitrogen in a 65L cylinder at 5C.

3. What will be the volume of 111 mole of nitrogen in the stratosphere where the temperature is -57C and pressure is 7.30 kPa.