Answer to Question #213817 in General Chemistry for laurynna ann

Question

Given the following cell notation for a voltaic cell Zn (s)  Zn2+ (0.045 M)  Cr3+ (0.800 M)  Cr (s)

a) Write the balanced half-cell and overall equations. [3 Marks]

b) Calculate the standard cell potential, Eo cell. [2 Marks]

c) Determine the cell potential, Ecell. [3 Marks]

d) If the cell is allowed to operate spontaneously, will Ecell increase, decrease or remain constant with time? Explain. [2 Marks]

e) Determine the standard free-energy change (G) and free-energy change (G) of the cell. [4 Marks]

Answer 1

a) Zn___Zn2+ + 2^-e

Cr3+ 3^-e ___Cr

b)$Eo= E1 + E2$

E_o= -0.76 +-0.74

= -0.02v