Two separate galvanic cells are constructed under standard conditions. In Cell 1, a Standard Hydrogen Electrode (SHE) is paired with a metal M . In the external circuit, electrons are observed to flow from the SHE to the metal M , and the standard cell potential is 0.34 V . In Cell 2, the metal M is paired with another metal X . In the external circuit, electrons flow from metal M to metal X , and the standard cell p

Step-by-step solution

In a galvanic cell, electrons flow in the external circuit from the anode (where oxidation occurs) to the cathode (where reduction occurs). For Cell 1: Electrons flow from the SHE to metal M . Therefore, SHE is the anode and M is the cathode. The standard reduction potential of the SHE is 0.00 V . E^ _ cell = E^ _ cathode - E^ _ anode 0.34 V = E^ _ M - 0.00 V E^ _ M = 0.34 V For Cell 2: Electrons flow from metal M to metal X . Therefore, M is the anode and X is the cathode. E^ _ cell = E^ _ cathode - E^ _ anode 0.4