Use the Standard Half-Cell Potentials Listed Below to Calculate the Standard

question 59

Multiple Choice

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25°C. Cu(s) + Mg²⁺(aq) → Mg(s) + Cu²⁺(aq)
Mg²⁺(aq) + 2 e⁻ → Mg(s) E° = -2.38 V
Cu²⁺(aq) + 2 e⁻ → Cu(s) E° = +0.34 V

• A) +2.04 V
• B) -2.04 V
• C) +2.72 V
• D) -2.72 V
• E) -1.36 V

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Definitions:

Program Scan

One of three parts of the PLC scan. During the program scan, the CPU scans each rung of the user program.

Controller Program

A specific set of coded instructions designed to be executed by a machine controller, such as a PLC, to perform specific tasks or operations.

MCR Instruction

A Master Control Reset instruction, typically used in programmable logic controllers (PLCs) to control the operation of blocks of logic or functions.

Circuit

A closed loop or pathway that allows for the flow of electricity, consisting of various electrical components such as resistors, capacitors, and inductors.