Question no.15

Asked by Pratik | 10th Oct, 2015, 12:35: PM

Expert Answer:

Cell space reaction space can space be space written space as space follows comma Zn space plus stack space Cd to the power of 2 plus end exponent with 0.2 space straight M below space rightwards arrow stack space Zn to the power of 2 plus space end exponent with 0.0004 space straight M below plus space Cd straight E to the power of straight o cell space equals space straight E to the power of straight o subscript Cd to the power of 2 plus end exponent comma Cd end subscript space minus straight E to the power of straight o subscript Zn to the power of 2 plus end exponent comma Zn end subscript space space space space space space space space space space space equals space minus 0.403 space straight V space minus space left parenthesis negative 0.763 space straight V right parenthesis space space space space space space space space space space space equals space 0.36 space straight V Applying space Nernst space equation space to space the space cell space reaction comma Ecell space equals straight E to the power of straight o cell space space minus space fraction numerator 2.303 space RT over denominator nF end fraction log fraction numerator left square bracket Zn to the power of 2 plus end exponent right square bracket over denominator left square bracket Cd to the power of 2 plus end exponent right square bracket end fraction space space space space space space space space space space space space equals space 0.36 space minus space fraction numerator 2.303 cross times 8.314 cross times 298 over denominator 2 cross times 96500 end fraction log fraction numerator 0.0004 over denominator 0.2 end fraction space space space space space space space space space space equals space 0.4399 space straight V  increment straight G space equals space minus nFE to the power of straight o space space space space space space space equals space minus 2 cross times 96500 cross times 0.36 space space space space space space space equals space minus space 69 comma 480 space straight J space space space space space space space equals space minus space 69.48 space kJ  Thus comma space emf space of space the space cell space is space 0.4399 space straight V space and space increment straight G space is space minus space 69.48 space kJ.

Answered by Prachi Sawant | 10th Oct, 2015, 06:41: PM