Gases

Question 1

Vapor Pressure

Answer 1

Pressure of the gas form of a liquid. Exists all over at the surface of the liquid.

Non-Volatile: VP = X_solventVp_solvent

Volatile: VP = (x_soluteVp_solute) + (x_solventVp_solvent)

Question 2

Ideal gas law

Answer 2

PV = nRT

Two assumptions:

1. Gas molecules are of negligble volume compared to the volume the gas occupies
2. All intermolecular forces between molecules are negligible

R= .0821

Question 3

Partial Pressure

Answer 3

P_total = P1 + P2 + P3 + P4…

Question 4

Real gases

Answer 4

Deviations from the ideal gas law will only be seen when:

1. The temperature is extremely low
2. Pressure is extremely high

Use PV/nRT ratio to see cause:

PV/nRT > 1: deviation due to volume

PV/nRT < 1: deviation due to intermolecular forces

Question 5

Standard Temperature and Pressure

Answer 5

P = 1atm
V = 22.4 L
n = 1 mole
R = 0.0821 L\*atm/mol\*K or 8.314 J/mol\*K
T = 273 K (0 C)

Question 6

Boyle’s Law

Answer 6

P₁V₁ = P₂V₂

Question 7

Charle’s Law

Answer 7

V₁/T₁ = V₂/T₂

Question 8

Gay-Lussac’s Law

Answer 8

P₁/T₁ = P₂/T₂

Question 9

Phase Transition Diagram

Answer 9

Question 10

heating curve

Answer 10