The magnitudes of the standard potentials of two metals M and X were determined to be

When the two electrodes are connected, current flows from M to X in the external circuit. When the electrode corresponding to half-reaction 1 is connected to the standard hydrogen electrode (SHE), current flows from M to the SHE.

(a) What are the signs of E° of the two half-reactions?

(b) What is the standard cell potential for the cell constructed from these two electrodes?

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(1) M¹ (aq) + e (2) X²+ (aq) + 2 e¯ M(s) → X(s) |E| = 0.25 V |E| = 0.65 V