2009-11-12 - Thermodynamics, Enthalpy and Hess's Law

2009-11-12 - Thermodynamics, Enthalpy and Hess's Law -...

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Chapter 9: Thermodynamics, Enthalpy and Hess’s Law References: - Chemical Principles, Steven S. Zumdahl, Fifth Edition, Houghton Mifflin Custom Publishing, Boston, MA - Professor Paul Mc Cord Notes, CH 301, University of Texas at Austin 1
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1 – HESS’S LAW Enthalpy (H) is a state function . In going from a particular set of reactants to a particular set of products, the change in enthalpy is the same whether the reaction takes place in one step or in a series of steps. Hess’s Law NO 2 example
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Characteristics of Enthalpy Changes 1. If a reaction is reversed, the sign of D H is also reversed. 2. The magnitude of H is directly proportional to the quantities of reactants and products in a reaction. If the coefficients in a balanced reaction are multiplied by an integer, the value of H is multiplied by the same integer XeF 4 example
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2 – STANDARD ENTHALPIES OF FORMATION Obtain the Enthalpy change ( D H ) by using a calorimeter can be very difficult Standard enthalpy of formation ( D
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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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2009-11-12 - Thermodynamics, Enthalpy and Hess's Law -...

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