CHEM102 Lecture Notes - Vapor Pressure, Phase Diagram, Melting Point

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bronzecoyote328

15 Aug 2014

School

University of Alberta

Department

Chemistry

Course

CHEM102

Professor

All

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CHEM102 Full Course Notes

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Document Summary

A particular phase is stable under the pressure and temperature within that region. It is the pressure and temperature when the two phases are equilibrium. Note that oc is the vapour pressure curve for the compound. *note that the slope of the solid line is positive for most substances. It is negative for water because solid ice is less dense than water. The temperature and pressure when three phases are in equilibrium. It is the pressure and temperature when condensation of the gas phase is impossible. 1 what would happen to co2 and h2o if temperature is increased from point a at 1 atmospheric pressure? (i) At -78oc, solid co2 changes to a gas (sublimation) Ice sublimes when pressure is below 0. 006 atm. Gaseous co2 changes to a liquid at p1 (condensation). At p2,liquid co2 changes to a solid (freezing) At p1 pressure, water vapor changes to a ice (deposition) At p2 pressure, ice changes to a liquid (meltling)

Related Questions

The vapour pressure of C5H12 at 25oC is 0.674 bar and that of C6H14 is 0.198 bar. You may assume that these liquids form an ideal solution.

(a) Using a graphing program, plot the bubble point line and the dew point line for this system on a pressureâcomposition (of C6H14) phase diagram. Make sure that the axes are properly labelled and that you indicate which phase(s) is/are stable in the various regions of the diagram.

Sulfur exhibits two solid phases, rhombic and monoclinic. Use the accompanying phase diagram for sulfur to answer the following questions. (The phase diagram is not to scale.)

A. How many triple points are in the phase diagram?

B. What phases are in equilibrium in each of the triple points?

C. What is the stable phase at 1 atm and 100^oC?

D. What are the normal melting point and normal boiling point of sulfur?

E. Which is the densest phase?

F. At a pressure of 1.0 x 10^-5 atm, can rhombic sulfur sublime?

G. What phase changes occur when the pressure on a sample of sulfur at 100^oC is increased from 1.0 x 10^-8 atm to 1500 atm?

sapphirebutterfly483

Sulfur exhibits two solid phases, rhombic and monoclinic. Use the accompanying phase diagram for sulfur to answer the following questions. (The phase diagram is not to scale.)