Faraday constant is expressed in which units?

Faraday constant is expressed in which units?

• A. Volts per mole
• B. Newtons per mole
• C. Joules per mole
• D. Coulombs per mole of electrons

Answer: (D)

The Faraday constant tells us how much electric charge is carried by one mole of electrons. Because it links charge to a specific amount of substance, its units must be charge per amount of substance. The natural choice is Coulombs per mole of electrons, written as C/mol e−. This reflects the definition: one mole of electrons carries about 96485 Coulombs of charge, so Q = F × n where n is the number of moles of electrons. The other options describe energy, force, or potential, not total charge per amount of substance, so they don’t fit.

The Faraday constant tells us how much electric charge is carried by one mole of electrons. Because it links charge to a specific amount of substance, its units must be charge per amount of substance. The natural choice is Coulombs per mole of electrons, written as C/mol e−. This reflects the definition: one mole of electrons carries about 96485 Coulombs of charge, so Q = F × n where n is the number of moles of electrons. The other options describe energy, force, or potential, not total charge per amount of substance, so they don’t fit.