Question

Calculate the standard molar enthalpy, entropy and free energy for the following reaction using ÆH of...

Calculate the standard molar enthalpy, entropy and free energy for the following

reaction using ÆH of and ÆS o values.

Zn(s) + CuSO4 (aq) ⇔ ZnSO4 (aq) + Cu(s)

b. What is standard cell potential for the above reaction. Use equation (2).

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Answer #1

H   = H products - H reactants

         = (-1063.17) -(-844.5)

         = -218.7 kJ

S = S products - S reactants

       = (-92.02 + 33.15) - (108.78 + 41.6)

       = - 21.1 J / K

     b)

G = H - TS

         = -218.7 - 298 x (-0.209)

         = -212.41 kJ

G = -nFEocell

-212.41 = -2 x 96485 x 10^-3 x Eocell

Eocell = 1.10 V

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