Question

Electrolysis can be used to determine atomic masses. A current of $0.55\text{A}$ deposits $0.55\text{g}$ of a certyain metal in $100$ minutes. Calculate the atomic mass of the metal if $\text{equivalent weight}=\frac{\text{molecular weight}}{3}$.

• A. $100$
• B. $96.5$
• C. $48.25$
• D. $144.75$

Answer 1

The correct option is C $48.25$

We know that $w=Z\times i\times t$
where $w=$Amount substance of deposited
$Z=\frac{\text{Equivalent weight}}{96500}=$ Electrochemical equivalent
$i=$ Amount of current
$t=$ Amount of time taken
$\therefore 0.55\text{g}=\frac{M/3}{96500}\times 0.55\times 100\times 60\Rightarrow M=48.25\text{g/mol}$