Question

What is the numerical value of one faraday?
A. 10000 C
B. 95000 C
C. 96.5 C
D. 96500 C

Answer 1

Hint: 1 Faraday is the charge of the 1 mole of the electron. 1mole is equivalent to $6.022\times {{10}^{23}}$ particles which may be atoms, molecules or ions. We know that the charge of an electron is (1.602$\times {{10}^{-19}}$ ). So by calculating the charge on 1mole of electrons we can get the desired result.

Complete step by step answer:
- 1 Faraday charge liberates one gram equivalent of substance at electrode. 1 faraday or faraday constant denoted by symbol F and this constant represents the magnitude of electric charge per mole of electrons. \[ F= {{e}^-}× {N_A}\] , where e is the charge of electrons in coulombs and \[{N_A}\] is the Avogadro constant.
Faraday constant=(1.602$\times {{10}^{-19}}$ )$\times $ ($6.022\times {{10}^{23}}$ )=96500 C.

Additional Information: Faraday constant is named after Michael Faraday. In chemistry and physics this constant represents the magnitude of electric charge per mole of electrons. One common use of this constant is in electrolysis calculations. One can divide the amount of charge in coulombs by the faraday constant in order to find the chemical amount of the element that has been oxidized.
> The value of F was first calculated by weighing the amount of silver deposited in an electrochemical reaction in which a measured current was passed for a measured time.
> In general for any electrochemical reaction, a measured value of current is made to pass for a certain time and the value of F was calculated by measuring the amount of silver deposited.

Note: The only difference between faraday unit of charge and faraday constant is that faraday unit of charge is represented by 96500C but faraday constant is represented by 96500 C/mol.