03) Phase Diagrams 9_5

# 03) Phase Diagrams 9_5 - a solid from where it is a...

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Phase Diagrams PTEC 3302 August 30th

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Important factors Temperature: Measure of the average kinetic  energy of the molecules (adding heat  increases energy, thus temperature is  increased) Pressure: reflection of the number of times  the molecules of the gas strike the walls of its  container Intermolecular forces: Forces of attraction  and repulsion between molecules
Phase diagram Graph of pressure plotted against  temperature MSN Encarta: Phase diagram for water

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Phase (PT) diagram Critical point: Upper limit of the vapor- pressure line (T c : critical temperature, and p c critical pressure, are the coordinates of the  critical point). Above critical temperature gas  cannot be liquefied, above critical pressure,  gas and liquid cannot coexist (pure  substances only) Triple point: Place where all three phases  exist at equilibrium
Phase (PT) diagram Sublimation-Pressure Line: Separates  conditions from where the substance is

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Unformatted text preview: a solid from where it is a gas (Below triple point temperature) Melting Point Line: Separates solid and liquid conditions Vapor-Pressure Line: Between T and C Clausius-Clapeyron Equation Equation of the vapor-pressure line L v is the heat of vaporization of one mole of liquid, R is the universal gas constant Eq. 2 produces a straight line graph when the logarithm of vapor pressure is plotted against the reciprocal of absolute temperature -= + -= = 2 1 1 2 2 1 1 ln 1 ln T T R L p p C T R L p RT L p dT dp v v v v v v v v Cox Charts C-C equation produces straight line only if we assume the heat of vaporization is constant Cox charts produce a straight line by modifying the absolute temperature scale PV Diagram, Saturation envelope PVT Diagram...
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## This note was uploaded on 09/21/2008 for the course PTEC 502 taught by Professor Sue during the Spring '08 term at University of Texas Medical Branch at Galveston.

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03) Phase Diagrams 9_5 - a solid from where it is a...

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