What is the number of moles of electrons passed when current of 5 ampere is passed through a solution of…
What is the number of moles of electrons passed when current of 5 ampere is passed through a solution of $\mathrm{FeCl}_3$ for 20 minutes?
- $6.25 \times 10^{-2}$
- $1.56 \times 10^{-2}$
- $3.12 \times 10^{-2}$
- $4.25 \times 10^{-2}$
Solution
$\begin{aligned}
& Q=I . t \\
& =5 \times 20 \times 60 \\
& =6000 \mathrm{C}
\end{aligned}$
Charge of 1 mole electrons $=96500 \mathrm{C}$
no. of moles of electrons $=\frac{\mathrm{Q}}{96500}=\frac{6000}{96500} \simeq 6.25 \times 10^{-2}$
Asked in: MHT CET 2021 (21 Sep Shift 2)
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