2. (20%) The electrochemical cell represented in accompanying diagram consists of two electrodes. One is a...

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2. (20%) The electrochemical cell represented in accompanying diagram consists of two electrodes. One is a solid NiO/Ni mixture. The other is a gaseous Oz electrode The porous platinum coating acts only as catalyst. Porous NiO/Ni platinum Zro,+Y,0, (solid solution) O2 The electrolyte is a ZrO/Y;O; solid solution yhat conducts oxygen ions (0) between the oxygen side and the NiO/Ni side. (a) Calculate the equilibrium oxygen partial pressure at the NiO/Ni electrode (2Ni + O, 2NIO) at 1000 K. (b) Identify the cathode and the anode in this electrochemical cell and write the half-cell reactions for the two electrodes. (Specify the direction of the reaction.) (c) What is the open circuit voltage at 1000 K when the pressure of oxygen on the oxygen electrode side is one atmosphere? (d) What is the open circuit voltage at 1000 K when the oxygen pressure on the oxygen electrode side is 1010 atm? (Reference data: For Ni +1/202 NiO AG' -244550 + 98.5 T, %3D whereAG°, is in joules and T is in Kelvin.) 2. (20%) The electrochemical cell represented in accompanying diagram consists of two electrodes. One is a solid NiO/Ni mixture. The other is a gaseous Oz electrode The porous platinum coating acts only as catalyst. Porous NiO/Ni platinum Zro,+Y,0, (solid solution) O2 The electrolyte is a ZrO/Y;O; solid solution yhat conducts oxygen ions (0) between the oxygen side and the NiO/Ni side. (a) Calculate the equilibrium oxygen partial pressure at the NiO/Ni electrode (2Ni + O, 2NIO) at 1000 K. (b) Identify the cathode and the anode in this electrochemical cell and write the half-cell reactions for the two electrodes. (Specify the direction of the reaction.) (c) What is the open circuit voltage at 1000 K when the pressure of oxygen on the oxygen electrode side is one atmosphere? (d) What is the open circuit voltage at 1000 K when the oxygen pressure on the oxygen electrode side is 1010 atm? (Reference data: For Ni +1/202 NiO AG' -244550 + 98.5 T, %3D whereAG°, is in joules and T is in Kelvin.)

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Standard free energy change for the reaction ZrO 2 Zr O 2 at 1727 ... View the full answer