Electrochemistry Question 7
Question 7 - 2024 (29 Jan Shift 1)
The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of $0.015 \mathrm{~A}$ for 15 minutes is _________ $\times 10^{-4} \mathrm{~g}$.
(Atomic mass of zinc $=65.4 \mathrm{amu}$)
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Answer (46)
Solution
$\mathrm{Zn}^{+2}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}$
$\mathrm{W}=\mathrm{Z} \times \mathrm{i} \times \mathrm{t}$
$=\frac{65.4}{2 \times 96500} \times 0.015 \times 15 \times 60$
$=45.75 \times 10^{-4} \mathrm{gm}$
