2010-01-23 - Thermo Review

2010-01-23 - Thermo Review - First Law of thermodynamics...

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w q E First Law of thermodynamics : The energy of the universe is constant A system transfer energy through heat and work w = work E = change in system’s internal energy ( U ) q = heat ENDOTHERMIC q > 0 heat flowing into the system; EXOTHERMIC q < 0 heat flowing out of the system w > 0 surroundings do work on the system; w < 0 system does work on the surrounding UNITS: E , q, w = Energy (J) 1 L.atm ~101.34 J Common type of work associated with chemical processes is work done by a gas (expansion), or work done to a gas (compression). V P w P = external pressure T nC q T mC q or C = Molar Heat Capacity (J/K-mol) C = Specific Heat Capacity (J/K-grams) Constant Volume T C n or m q E v ) ( Constant Pressure PV E H H = Enthalpy T C n or m q H P ) ( State Functions The value of a state function does not depend on how the system arrived at the present state. A change in this function (property) in going from one state to another is independent of the particular pathway R C v 2 3 R C v 2 5 R C v 2 6 Monoatomic Diatomic Polyatomic R C C v p Ideal Gases Heat Capacity Calorimeters H T C m q water s water cal , - Constant Pressure (coffee-cup) surr sys q q - Constant Volume (bomb calorimeter)
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This note was uploaded on 03/06/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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2010-01-23 - Thermo Review - First Law of thermodynamics...

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