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Vaporization

Vaporization

Vaporization

Vaporization

Vaporization

What factors affect the
rate of evaporation?

How Temperature Affects
Evaporation Rate

What factors affect the
rate of evaporation?

What factors affect
equilibrium vapor pressure?

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What factors affect
equilibrium vapor pressure?

Boiling

Boiling

Slide 18

An Exponential Equation
for Pressure

Slide 20

The 2-Point
Clausius-Clapeyron Equation

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Vaporization

End of slide show, click to exit.

Vaporization

Vaporization

Vaporization

Vaporization

Vaporization

What factors affect the
rate of evaporation?

How Temperature Affects
Evaporation Rate

What factors affect the
rate of evaporation?

What factors affect
equilibrium vapor pressure?

Slide 10

Slide 11

Slide 12

Slide 13

Slide 14

What factors affect
equilibrium vapor pressure?

Boiling

Boiling

Slide 18

An Exponential Equation
for Pressure

P = β exp(-ΔHvap
/RT)

ln P = ln β + ln exp(-ΔHvap
/ RT)

ln P = ln β - ΔHvap
/ RT

ln P = ln β - (ΔHvap
/ R) (1 / T)

Y = b + mX

Plot P against 1 / T.  Slope = -ΔHvap/R

ΔHvap = -R .
Slope    where R = 8.314 J / K mol

Slide 20

The 2-Point
Clausius-Clapeyron Equation

ln P = ln β - (ΔHvap
/ R) (1 / T)

ln P2 = ln β -
(ΔHvap / R) ( 1 / T2)

Ln P1 = ln β -
(ΔHvap / R) (1 / T1)

ln P2 - ln P1
= (ΔHvap / R) (1 / T1
- 1 / T2)

Ln (P2 / P1)
= (ΔHvap / R) (1 / T1 - 1 / T2)

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Second level

Third level

Fourth level

Fifth level

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Vaporization

Evaporation in an
open

container.  Condensation

rate will
probably never be

as high as
evaporation

rate.

Vaporization