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Chapter 10, Sections 10.8 &10.9: Phase Changes & Phase Diagrams

Chapter 10, Sections 10.8 &10.9: Phase Changes & Phase Diagrams. Phase Changes Vapor Pressure & the Clausius-Clapeyron equation Heating Curves, melting point & boiling point Phase Diagrams. Figure 10.42: P vap Variation with Temperature. Example 1. A 0.195 gram sample of water is injected

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Chapter 10, Sections 10.8 &10.9: Phase Changes & Phase Diagrams

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  1. Chapter 10, Sections 10.8 &10.9:Phase Changes & Phase Diagrams • Phase Changes • Vapor Pressure & the Clausius-Clapeyron equation • Heating Curves, melting point & boiling point • Phase Diagrams

  2. Figure 10.42: Pvap Variation with Temperature

  3. Example 1 A 0.195 gram sample of water is injected into a 2.55 liter flask at 30.0°C. At equilibrium, what phase(s) of H2O will be present? (i.e. Solid, liquid, gas, or a combination of two or more of these?) The vapor pressure of water at 30.0°C is 31.8 mmHg.

  4. Example 2 What is the standard enthalpy of vaporization for a liquid that has a vapor pressure of 641 torr at 85.2°C and a normal boiling point of 95.6°C?

  5. Figure 10.49: Phase diagram for water

  6. Figure 10.50: Phase diagram for water – thought experiments

  7. Figure 10.52: Phase Diagram for CO2

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