vapor pressure

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VAPOR PRESSURE Evaporation l/g equilibrium
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Vapor Pressure

• pressure in space above a liquid in a CLOSED
  container

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PROPERTIES

• 1. closed container
• 2. temperature dependent
• 3. subject to all laws of partial pressures
• 4. dynamic system

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Vapor Pressure temperature dependent
P
T
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To plot in a linear fashion, must transform the
variables.
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ln P
1/T (K)
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y mx b R 8.3145 J/K mol
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therefore
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define 2 points
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ln P
2
1/T (K)
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Subtract ln P1 - ln P2
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Collect terms factor
Clausius-Clapeyron Equation
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4. The temperature inside a pressure cooker is
1150C. What is the vapor pressure of water
inside the pressure cooker?
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SUMMARY OF IDEAS TO BE CONSIDERED 1. vapor
pressure - temperature dependent 2. volume
determines time needed to establish
vapor pressure - NOT final pressure
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3. ?H (condensation) -?H (vaporization) 4.
Critical Point - (T,P) above which vapor
cannot be liquefied - regardless of
pressure 5. Boiling temperature where vapor
pressure of liquid is the same as
atmospheric pressure