iPad 1:43 PM 95 % a session.masteringchemistry.com C) MasteringChemistry: Course
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iPad 1:43 PM 95 % a session.masteringchemistry.com C) MasteringChemistry: Course Home CH223 Winter 2015 MC11: Thermodynamics ± Cell Potential and Free Energy Please Show Steps And Correct Answ MC11: Thermodynamics Signed in as Priscilla Pimentel Help Close Resources « previous evious 15 of 25 | next » ± Cell Potential and Free Energy Free-energy change, G° , is related to cell potential, E, by the equation where n is the number of moles of electrons transferred and F-96, 500 C/(mol e-) is the Faraday constant. When Eo is measured in volts, Go must be in joules since 1 J 1 C . V Part A Calculate the standard free-energy change at 25 ° C for the following reaction: Mg(s) + Fe2+ (aq)Mg2+ (aq) + Fe(s) Express your answer to three significant figures and include the appropriate units. AC= Value Units Submit Hints My Answers Give Up Review Part Part B Calculate the standard cell potential at 25 ° C for the reaction x(s) + 2Y+ (aq)X+ (aq) + 2Y(s) where H)--893kJ and ~ --1 87J/K Express your answer to three significant figures and include the appropriate units. B"=1 Value Units Submit Hints My Answers Give Up Review Part Provide Feedback ContinueExplanation / Answer
detla G0 = -nF Ecell0
= - 2x 96, 500 x (E0Fe+2/Fe - E0Mg+2/Mg)
= - 2x 96500 x (-0.44+ 2.37)
= -372490J
part B
delt G0= delta H0- T delta S0
= -893000 + 298 x187
= -837.274kJ
detla G0 = -nF Ecell0
-837274= - 2 x 96500 x Ecell0
Ecell0 = 4.33V
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