entropy and spontaneity thermochemistry notes

entropy and spontaneity thermochemistry notes - Notes~...

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Unformatted text preview: Notes~ Thermo6 ­ Entropy and Spontaneity ­ filled in.notebook The Driving Forces: Energy Spread and Matter Spread Notes #6 Energy Spread ­ Matter Spread ­ Entropy ­ Entropy state of a substance depends on: State of matter Temperature(K) Molecular complexity Estimating the Change in Entropy (∆S) for Chemical or Physical Processes Ex: Change of state Ex: Dissolving Ex: Chemical Rxn March 27, 2015 Notes~ Thermo6 ­ Entropy and Spontaneity ­ filled in.notebook Calculating the Entropy Change for a Reaction (∆Srxn) given Standard Entropies (So) The So can be used to calculate the ∆Srxn for a chemical reaction using the following equation: ∆Srxn = [Sum of ∆So of the products] — [Sum of ∆So of the reactants] Example: What is ∆Srxn for the following reaction: 2 CO (g) + O2 (g) à 2 CO2 (g) Use a Table of So to look up the values for the ∆So of CO , O2 and CO2 . So O2 = 205.0 J/mol∙K ; So CO = 197.6 J/mol∙K ; So CO2 = 213.8 J/mol∙K ∆Srxn = Changes in Entropy and Enthalpy and the Spontaneity of Chemical/Physical Processes Spontaneity: ∆S measures: value of ∆H ∆H measures: value of ∆S Spontaneity March 27, 2015...
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