TOPICS 1. Intermolecular Forces 2. Properties of Gases 3. Pressure 4. Gas Laws – Boyle, Charles, Lussac 5. Ideal Gas Law 6. Gas Stoichiometry 7. Partial Pressure 8. Kinetic Molecular Theory 9. Effusion & Diffusion 10.Real Gases
Dec 21, 2015
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.