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Chapter 2: Internal Energy (U), Work (w), Heat (q ...

Winter 2013 Chem 254: Introductory Thermodynamics Chapter 2: Internal Energy , work , Heat and Enthalpy 13 Chapter 2: Internal Energy (U), work (w), Heat (q), Enthalpy (H) .. 13 Heat Capacities .. 16 Calculating U, H, w, q in Ideal Gas .. 18 Isothermal Compression .. 21 Reversible Process (limiting process) .. 22 Isothermal Expansion .. 22 Chapter 2: Internal Energy (U), work (w), Heat (q), Enthalpy (H) Internal Energy (excludes motion and rotation of vessel) Look at isolated part of universe systemEnvironmentU UU Total = isolated First law of thermodynamics: - Total U for isolated system is constant - Energy can be exchanged between various components - Energy forms can be interconverted Eg.

o specify T V P,, ' o U U T P V U T P V( , , ) ( , , ) 2 2 2 1 1 1 ' o H H T P V H T P V( , , ) ( , , ) 2 2 2 1 1 1 Change in UH, are the same for both paths Change in qw, are different for different paths Calculating ΔU, ΔH, w, q in Ideal Gas 1) Calculating ''UH, is easy if 'T

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