Question

How many faradays are required to convert a mole of cr2o72- to cr3+?

Answer 1

Answer:

Concept:

The electric charge density per electron mole is represented by the Faraday constant. The Faraday constant has the same meaning as Faraday. represented by the letter F. The constant bears Michael Faraday's name. It can be used in a wide variety of electrolysis processes.

Step-by-step Explanation:

Given:

$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2^-}$

$\mathrm{Cr}^{3^+}+$

Find:

How many faradays are required

Solution:

                               $\begin{aligned}\mathrm{Cr}_{2} \mathrm{O}_{7}^{2^-} & \rightarrow \mathrm{Cr}^{3^+}+\\2 x+7(-2) &=-2 \\2 x &=+12 \\x &=+6 \\+6 & \end{aligned}$

               $1 \mathrm{~mol} \mathrm{} \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} requires 6 moles electron =6 \mathrm{~F} charge\\\\ \therefore Number of Faraday's required =6 .$

#SPJ3