MHT CET · Chemistry · Electrochemistry
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?
- A \(6.25 \times 10^{-2}\)
- B \(1.56 \times 10^{-2}\)
- C \(3.12 \times 10^{-2}\)
- D \(4.25 \times 10^{-2}\)
Answer & Solution
Correct Answer
(A) \(6.25 \times 10^{-2}\)
Step-by-step Solution
Detailed explanation
\(
\begin{aligned}
& Q=I . t \\
& =5 \times 20 \times 60 \\
& =6000 \mathrm{C}
\end{aligned}
\)
Charge of 1 mole electrons \(=96500 \mathrm{C}\)
no. of moles of electrons \(=\frac{\mathrm{Q}}{96500}=\frac{6000}{96500} \simeq 6.25 \times 10^{-2}\)
\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 \(=\frac{\mathrm{Q}}{96500}=\frac{6000}{96500} \simeq 6.25 \times 10^{-2}\)
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