Question

How many moles of electrons are required for reduction of 2 moles of Zn²⁺ to Zn? How many Faradays of electricity will be required?

Answer 1

The balanced equation for the reduction of Zn²⁺ to Zn is:

\[\ce{Zn^{2+} (aq) + 2e- -> Zn(s)}\]

1 mole of Zn²⁺ is reduced to Zn by 2 moles of the electron. Hence, for the reduction of 2 moles of Zn²⁺, 4 moles of electrons will be required.

As 1 mole of electron carries 1 Faraday of electricity. Hence, 4 Faradays of electricity will be required to form 2 mole of Zn from Zn²⁺.