Question

The number of Faradays(F) required to produce 20g of calcium from molten $CaC{l}_2$ (Atomic mass of $CaC{l}_2$ g $mo{l}^{-1}$) is :

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (A)

$\begin{array}{l}w=ZQ\\ Q=\frac{w}{Z}=\frac{20}{40/2}F=1F\end{array}$
where $Z=\frac{E}{F}$