Lec-40-FinalExamReview-1

Lec-40-FinalExamReview-1 - Lec-40-FinalExamReview-1...

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Lec-40-FinalExamReview-1 12/9/2009 Thermodynamics. First Principle. Thermochemistry. Second Principle. Spontaneity. Gibbs Free Energy. EMF. 1 Lec-40: Final Exam - Review 1 Final Exam Tuesday Dec. 15, 8:15 − 10:45 PM Old Chemistry 116, ESS 001, Javits 101 Review Final Exam Sunday Dec. 13, 3:00 − 6:00 PM Old Chemistry 116 First Principle of Thermodynamics Conservation of energy: energy cannot be created or destroyed. E q w    Energy exchanged by the sy Change in internal energy o stem with surroundings as f the syst heat or wo em rk 2
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Lec-40-FinalExamReview-1 12/9/2009 Thermodynamics. First Principle. Thermochemistry. Second Principle. Spontaneity. Gibbs Free Energy. EMF. 2 Volume type of work – P ext constant 0 0 fi V V V w 0 0 V V V w ext i0 00 f if 0 w w PV V w V    3 Interaction of the system with the surroundings: heat q System: gas The temperatures of the system and its surroundings are different. Energy is exchanged between the system and its surroundings through the walls . ( T sys > T surr ): Heat q flows from the system to the surroundings ( q < 0). ( T sys < T surr ): Heat q flows from the surroundings to the system ( q > 0). Heat q has units of energy (J) T sys T surr 4
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Lec-40-FinalExamReview-1 12/9/2009 Thermodynamics. First Principle. Thermochemistry. Second Principle. Spontaneity. Gibbs Free Energy. EMF. 3 Enthalpy Changes For any given transformation at constant pressure: (initial) → (final) > 0 the system releases energy to its surroundings 0 exothermic 0 the system absorbs energy from its surroundings 0 endothermic proce proce s ss s f i p H H H H q H   5 Heat Capacity (at constant pressure) specific extensive molar per unit mass per mol p m TT m C T c n c q   0 energy has units of temper J t ,, a C ure p q H C C    Heat capacity: heat exchanged by the system per unit change in its temperature under constant external pressure : 0 J heat capacity per unit mass, kg C C c m 0 J heat capacity per mol, mol C m C c n 6
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Lec-40-FinalExamReview-1 12/9/2009 Thermodynamics. First Principle. Thermochemistry. Second Principle. Spontaneity. Gibbs Free Energy. EMF. 4 Enthalpy Changes: Physical and Chemical Processes                 -1 22 -1 2 2 2 2 2 H g O g 2H O g 1 H g O g H O g 241.8kJmol 2 reactio 483.6kJm n ol reaction 2 1 2 H H H H          Δ H reaction at 25 °C and 1 bar: standard enthalpies of reaction Δ H °         2 0 2 0 H O H O g H (1 bar, 25 C) (1 bar, 25 C 44.0 44.0 O g H O kJ/m kJ/mol ol ) H H  7 Enthalpy Changes: Formation Reactions Δ H f ° Standard molar enthalpies of formation: enthalpies per mol of reaction Δ f of a substance starting from the elements in their stable state at standard conditions (1 bar and 25°C)
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This note was uploaded on 01/05/2010 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-40-FinalExamReview-1 - Lec-40-FinalExamReview-1...

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