MasteringChemistry: CH 17 HW Internet Explorer ssignmentProblemID-98157757 ng E°

Question

MasteringChemistry: CH 17 HW Internet Explorer ssignmentProblemID-98157757 ng E°cell, Keq, and Gibbs Free Energy Constants The following values may be useful when solving this tutorial. Constant Value E0.337 V E0.277 V 8.314 J.mol 1.K 1 F 96,485 C/mol 298 K Part A In the activity, click on the Eeel and Ke quantities to observe how they are calculate Keq for the following redox reaction that occurs in an electrochemic cathode and an anode. The two half-reactions that occur in the cell are Cu2 (aq) + 2e -Cu(s) and Co(s) -Co? (aq) he net reaction is

Explanation / Answer

E0cell = E0Cu - E0Co = 0.337 - ( - 0.277 ) = 0.614 V

We know,

deltaG0 = - R * T * lnK and deltaG0 = - n F E0cell

SO, E0cell = ( R * T * lnK ) / ( n * F )

lnK = n * F * E0cell / ( R * T )

lnK = 2 * 96485 * 0.614 / ( 8.314 * 298 )

lnK = 47.8

K = 5.74 * 1020

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