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Cell Potential and Free Energy

AP Chemistry· difficulty 4/5

Standard potentials: Cu2+/Cu=+0.34Cu^{2+}/Cu = +0.34 V, Zn2+/Zn=−0.76Zn^{2+}/Zn = -0.76 V. The standard EMF of the Zn|Zn²⁺||Cu²⁺|Cu galvanic cell is

  • A

    +0.42+0.42 V

  • B

    −1.10-1.10 V

  • C

    +0.34+0.34 V

  • D

    +1.10+1.10 V

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Explanation

E°cell = E°(cathode) - E°(anode) = 0.34 - (-0.76) = +1.10 V. Zn oxidizes (anode), Cu²⁺ reduces (cathode).

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