Given E°(Mg²⁺/Mg) = −2.37 V and E°(Ag⁺/Ag) = +0.80 V, what is the standard emf of a cell made from these two electrodes?
Correct answer B. 3.17 V
Explanation
Silver is the cathode. E°cell = E°(cathode) − E°(anode) = 0.80 − (−2.37) = 3.17 V. Subtracting the values the wrong way gives 1.57 V.
Answer checked How we write and check questions
Discussion