gibbs free energy thermochemistry notes

gibbs free energy thermochemistry notes - Notes~ Thermo7 ­...

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Unformatted text preview: Notes~ Thermo7 ­ Gibbs Free Energy and Spontaneity ­ filled in.notebook Gibbs Free Energy: ∆H, ∆S and Spontaneity Notes #7 Let's Review: value of ∆H value of ∆S Spontaneity Calculating the Gibbs Free Energy (∆G) for Chemical or Physical Processes using ∆H & ∆S & Temp: Use the equation: ∆G = ∆H ­ T*∆S Note: T must be in Kelvin Remember: 0oC = 273 K, therefore, K = oC + 273 Let's Explore the Relationship between the signs of ∆G , ∆H & ∆S: ∆G = ∆H ­ T*∆S if ­∆H and +∆S if +∆H and ­∆S if ­∆H and ­∆S if +∆H and +∆S April 13, 2015 Notes~ Thermo7 ­ Gibbs Free Energy and Spontaneity ­ filled in.notebook Calculating the Free Energy Change for a Reaction (∆Grxn) given Table of ∆Gof The Go can be used to calculate the ∆Grxn for a chemical reaction using the following equation: ∆Grxn = [Sum of ∆Gfo of the products] — [Sum of ∆Gfo of the reactants] Example: What is ∆Grxn for the following reaction: 2 CO (g) + O2 (g) à 2 CO2 (g) Use a Table of Gof to look up the values for the ∆Gof of CO , O2 and CO2 . ∆Grxn = Changes in Entropy and Enthalpy and the Spontaneity of Chemical/Physical Processes Spontaneity: ∆S measures: ∆H measures: April 13, 2015...
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