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Question
How many hours does it take to reduce 3 moles of `Fe^(3+)`to `Fe^(2+)` with 2.0 A Current intensity?
Solution
`Fe^(3+) + e^(-) -> Fe^(2+)`
∵ for 1 mole of `Fe^(3+)`, 1 mole of `e^(-)` is required
∴ for 3 moles of `Fe^(3+)`, 3 moles of `e^(-)` are required
`∴ 3e^(-) = 3F = 3 xx 96500C`
`Q = I xx t`
`3 xx 96500 = 2 xx t`
`:. t = (3 xx96500)/(2 xx 3600)`
t = 40.2 hrs
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Normality, Molality - Simple Problems Relating Mass, Molar Mass and Mole
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