Lec03_drobny_11 - Lecture 3:Enthalpy Reading Zumdahl 9.2...

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Lecture 3:Enthalpy • Reading: Zumdahl 9.2, 9.3 • Recommended Problems: 9.11,9.23-25, 9.27, 9.29 • Outline – Defnition oF Heat Capacity (C V ) – Defnition oF Enthalpy ( Δ H and C P ) – Calculating Δ E and Δ H using C V and C P
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Facts: Heat Transfer at Constant P • Many (most!) chemical reactions occur at constant pressure (P), not constant volume V. • In most chemical reactions of interest, volume changes and heat is transferred at constant pressure P. • Now Δ E=nC v Δ T=q-P Δ V for ideal gases. • If Δ V=0, Δ E=q v . • So q=nC v Δ T only for heat transfer at constant volume. • We need a new state function to express heat transfer at constant P!
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Introducing Enthalpy • Thermodynamic Defnition oF Enthalpy (H): H = E + PV E = energy oF the system P = pressure oF the system V = volume oF the system
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• Consider a process carried out at constant pressure. • IF work is oF the Form -P
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Fall '12 term at University of Washington.

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Lec03_drobny_11 - Lecture 3:Enthalpy Reading Zumdahl 9.2...

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