Question

How many hours does it take to reduce
3 Mole of Fe^+3 to Fe^+2 with 2.0A current?

Answer 1

Answer:

Fe³⁺ + e⁻ ⇄ Fe²⁻

Here it is clear that one mole of Fe³⁺ gain one mole of electrons to produce one mole of Fe²⁺ .

So, for 3 mole of Fe³⁺ to Fe²⁺, 3mole of elections is require.

Also we know , 1 mole of electrons is equivalent with 96500 C

so, 3 mole of electrons = 3 × 96500C

e.g., charge , Q = 289500C

∵ Q = It

Here, I is current and t is time taken.

289500 = 2 × t

t = 144750 sec = 40.2 hrs

Hence, answer is 40.2 hrs

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