Please help check I did these the right way show steps QUESTION 3 4 points Save

Question

Please help check I did these the right way show steps

QUESTION 3 4 points Save Answer f a galvanic cel s 0.100 M and the initial concentration of zinc (II) is 1.900 M, what is the potential of this voltaic cell with these starting concentrations of metal cations? Hint: Calculate the standard cell potential for this cell first, then use the Nernst equation to determine the cell potential. O 0.0592 V 1.066 V O 1.104 V O 1.142 V QUESTION 4 4 points Save Answer Why did the cell potential from question #3 change from the standard cell potential? Since the zinc (II) concentration was larger, the reaction shifted toward reactants and therefore the potential was less positive. Since the zinc concentration was larger, the reaction shifted toward products and therefore the potential was more positive O Since the copper(I concentration was larger, the reaction shifted toward reactants and therefore the potential was less positive O Since the concentrations of zinc (II) and copper (ll) were at standard conditions, there was no change in the cell potential.

Explanation / Answer

Ans 3. B 1.066 V

the nernst equation is

Ecell = Eocell - 0.059/2 log [Zn2+]/ [Cu2+]

Eocell = Ecathode - E anode

Eocell = 0.34 - (-0.76) = 1.10 V

Putting the value in the nernst equation

E cell = 1.10 - 0.059/2 log (1.90) /(0.100)

E cell = 1.066 V

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