# Lecture2 - from last lecture: E = KE + PE Etotal = constant...

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E = KE + PE E total = constant ∆E = q + w V P w w < 0 if system does work w > 0 if surroundings does work from last lecture: 1

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V P q E The change in energy of the system: What if the volume stays the same? (constant volume process?) w q E q is the heat that the system is given w is the work that the surroundings does to the system 2
Constant Volume Processes For a constant volume process, the change in internal energy of the system is equal to the heat (q) transferred. No PV work is possible, since there is no change in volume. E = q + w = q V 0 “constant V” 3

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Lecture 2: Enthalpy Reading: Zumdahl 9.2, 9.3 • Outline – Definition of Enthalpy (H) – Definition of Heat Capacity (C v and C p ) – Calculating E and H using C v and C p 4
Definition of Enthalpy • Thermodynamic Definition of Enthalpy (H): H = E + PV E = energy of the system P = pressure of the system V = volume of the system 5

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Definition of Enthalpy (cont.) • Consider a process carried out at constant pressure . • If work is of the form -P V, then: E = q p + w = q p - P V E + P V = q p q p is heat transferred at constant pressure. 6
• Recall: H = E + PV H = E + (PV) = E + P V (P is constant) = q p • Or H = q p • The change in enthalpy is equal to the heat transferred at constant pressure. 7

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## This note was uploaded on 01/18/2012 for the course CHEM 152B taught by Professor Zhang during the Winter '12 term at University of Washington.

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Lecture2 - from last lecture: E = KE + PE Etotal = constant...

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