Electrochemistry

Question

What is the maximum energy produced when 15.0 g of Zn is completely reacted in a Zn-Cu electrochemical cell that has an average cell potential of 1.05 V? for the following reaction: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s).

Answer 1

Zn(s) + CuSO₄(aq) ==> ZnSO₄(aq) + Cu(s) ... Eº = 1.05 V

∆Gº = -nFEº = -2 mol e- x 96485C/mol e- x 1.05 V = 202,619 CV = 202,619 J = 2.0x10⁵ J per mol of Zn

Atomic mass Zn = 65.4 g / mol

15.0 g Zn x 1 mol / 65.4 g = 0.229 mols Zn

Maximum work = 0.229 mols x 2.0x10⁵ J/mol = 45,800 J