Lecture 30 110508 - Announcements Chapter 8 Homework due...

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Unformatted text preview: Announcements Chapter 8 Homework due Wednesday Nov. 5 Chapter 9 Energy and Chemistry. Homework due Wednesday November 12 Chapter 10 Entropy and Second Law of Thermodynamics start on Friday Focus on sections 10.2-10.7 Next Exam November 12 on Chapters 7, 8 and 9 Hand out review sheet on Friday Energy and Enthalpy 2200 E = q + w = q - P V Amount of heat transferred: q = E + P V Chemical reaction at constant pressure (ENTHALPY CHANGE) q p = E + P V = H H = H final H init ial Exothermic : heat evolves from a system, H < 0 Endothermic: heat absorbed by a system, H > 0 Phase Changes Molar Enthalpies and Temperatures for phase changes of water Phase change of Water Phase Changes Enthalpies of Physical Change H subl = H fusion + H vap Phase Changes Molar Heat of Fusion ( H fusion ): The energy required t o melt one mole of solid (in kJ). Molar Heat of Vapor ization ( H vap ): The energy (in kJ) required to vapor ize one mole of liquid. Example Calculate the enthalpy change when 240. g of ice melt. H fusion = 6009.5 J/mol Vaporization and Electricity Production Enthalpies of Chemical Change Often called heats of reaction ( H reaction ) Endother mic : Heat flows into the system from the surroundings and H has a positive sign...
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Lecture 30 110508 - Announcements Chapter 8 Homework due...

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