Gases

Question 1

Density of a gas formula:

Answer 1

Density = PM/ RT

P: pressure of the gas
M: molar mass of the gas
R: 0.0821
T: temperature (K)

Question 2

A gas’ density is directly proportional to its:

Answer 2

Molar mass

Question 3

The gas with the _________ mass (molecular weight) will have the highest density

Answer 3

Highest

Question 4

Boyle’s law

Answer 4

• pressure is inversely proportional to its volume under constant temperature

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Question 5

1 L = ____ mL = ____ cm³

Answer 5

1000
1000

Question 6

1 atm = ____ torr = ____ mmHg

Answer 6

760
760

Question 7

ideal gas law rules:

Answer 7

• gas molecules take up no volume
• all collisions are elastic = no intermolecular forces = no loss of kinetic energy
• the avergae kinetic energy of a gas depends on the systems temperature

Question 8

gases behave most ideally at ____ pressure and ____ temperature

Answer 8

• low pressure: volume of the container is must larger than volume occupied by the gas molecules making their volume negligable
• high temperature: gas molecules move fast and experience no intermolecular forces

Question 9

ideal gas law

Answer 9

PV = nRT
* P = pressure
* V = volume
* n = moles
* R = 0.0821 L x atm/mol x K
* T = temperature (K)

Question 10

charle’s law

Answer 10

volume and temperature are directly proportional under constant pressure

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Question 11

Avogadro’s law:

Answer 11

• volume and the number of moles are directly proportional
• equal volumes of all gasses at the same temperature and pressure have the same number of molecules

Question 12

dalton’s law of partial pressure

Answer 12

• in a mixture of gases, the total pressure of the mixture is equal to the summation of partial pressure of individual gases

Question 13

how to calculate partial pressure of a gas:

Answer 13

P₁ = (X₁)(P_total)
* P₁ = partial pressure of a gas
* X₁ = mole fraction of the gas
* P_total = product of the total pressure