Question

In electrolytic reduction of a nitroarene with 50% current efficiency, 20.50 g of the compound is reduced by $2\times 96500$ C of electric charge. The molar mass of the compound is :

• A. 20.50 g
• B. 10.25 g
• C. 123.00 g
• D. 61.50 g

Answer 1

The correct option is C

123.00 g

$Ar-N{O}_2+6H^{+}+6e^{-}\to Ar-N{H}_2+2H_{2}OW=zQ\eta =\frac{molarmass\times 2\times 96500}{6\times 96500}\times \frac{50}{100}\Rightarrow molarmass=6W=6\times 20.50g=123g$