111708

# 111708 - y Features of a phase diagram – Area values of P...

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Vapor Pressure y The vapor pressure of water is 23.8 torr at 25 o C and 93.7 torr at 50 o C. What is the heat of vaporization of water?

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Vapor Pressure y Vapor pressure is the pressure of the vapor over a liquid present at equilibrium y Vapor pressure is determined principally by the size of the IMFs of the liquid y Vapor pressure increases significantly with temperature y Something with a high vapor pressure is said to be volatile
Boiling Point y The boiling point is the temperature at which the vapor pressure of a liquid is equal to the atmospheric pressure y Standard boiling point: the temperature at which the vapor pressure of a liquid equals 1 atm or 760 torr

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Boiling Point
Melting Point y The melting point is the temperature at which a solid changes to a liquid. y The temperature remains constant while a substance melts or boils.

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Melting Point
Phase Diagrams y A general phase diagram – summarizes phase changes as a function of temperature and pressure

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Unformatted text preview: y Features of a phase diagram – { Area: values of P and T where only one phase exists { Line: values of P and T where two phases can exist at one time { Point: values of P and T where three phases can exist at one time Phase Diagrams y Critical Point – where the line between liquid and gas phases terminates, above this point the liquid and gas phases are indistinguishable { Critical Temperature: the temperature above which the vapor cannot be distinguished from the liquid { Critical Pressure: the pressure required to liquefy the vapor at the critical temperature { Supercritical Region: P and T above the critical point Phase Diagrams P 1.0 atm solid liquid gas Critical point Triple point Temperature Phase Diagrams Heating Curve Heating Curve y 100 g of ice is initially at -50 o C, how much energy is required to make it steam at 150 o C?...
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## This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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111708 - y Features of a phase diagram – Area values of P...

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