MasteringChemistry. Lecture Prep Week 11 Google Chrome https://session.mastering

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MasteringChemistry. Lecture Prep Week 11 Google Chrome https://session.masteringchemistry.com/myct/itemView?offset-next&assignmentProblemID; 8894392 CHEM 1415 Spring 2016 Lecture Prep Week 11 t Cell Potential and Free Energy t Cell Potential and Free Energy Part A Free-energy change, AGO, is related to cell potential, Eo, by the equation Calculate the standard free-energy change at 25 C for the following reaction AG FE Mg (s) +Fe2 (aq)- Mgt q) F where n is the number of moles of electrons transferred and F 396, 500 C/(mol e is the Faraday constant. When EO is measured in Express your answer to three significant figures and include the appropriate units. volts, AGO must be in joules since 1 J 1 C. V Value Units AG Submit Hints My Answers Give Up Review Part Part B Calculate the standard cell potential at25 C for the reaction q) +2Yi where AH 290 kJ and AS 245 J/K Express your answer to three significant figures and include the appropriate units. Value Units Hints My Answers Give Up Review Part Search Windows Help Close Resources previous I 2 of 10 l next Provide Feedback Continue A 4) 9:39 PM 4/7/2016

Explanation / Answer

part A

DG0 = -nFE0

E0cell = Ec - Ea

      = -0.44 -(-2.372)

    = 1.932 v

DG0= - 2*96500*1.932

    = -372876 j

part B

DG0= DH0 - TDS0

   = (-829*10^3) - (298*-245)

   = -755990 j

-755990 = -2*96500*x

x = E0cell = 3.917 v

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