5-EnthalpyChanges

5-EnthalpyChanges - Data Table Standard Heats of Formation...

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Unformatted text preview: Data Table Standard Heats of Formation Problem Set Applications of Thermodynamics Enthalpy Changes and Thermodynamic Applications Edward A. Mottel Department of Chemistry Rose-Hulman Institute of Technology 05/12/09 Thermodynamic Applications Reading Assignment: Zumdahl, Chapter 9.2, 9.5-9.8, 10.14 Hess Law is used to calculate the heat released by a chemical reaction. Applications of thermodynamic principles Enthalpy H = E + PV Heat energy content of a molecule internal molecular motion electronic energy pressure-volume work required to maintain the volume of the molecule Only defined for a constant pressure process Enthalpy Values Absolute enthalpy values cannot be measured, but changes in enthalpy can be measured relative to an arbitrary reference state Enthalpy Heat of Formation Values C (gr) Reference Reference State State An element in its most stable phase at 25 C and 1 atm pressure H f = 0 H 2 O 2 (l) Standard Standard State State CH 3 OH (l) C 10 H 8 (s) Standard Standard State State An element, molecule or ion at 25 C and 1 atm pressure H f =-187.78 kJmol-1 H f = +78.53 kJmol-1 H f =-238.66 kJmol-1...
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5-EnthalpyChanges - Data Table Standard Heats of Formation...

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