Question

the number of moles of Mn04- reduced to Mn2+ by the addition of 7.5 moles electrons in Mno4- is

Answer 1

Answer:

We will write the reactions and do molar analysis to get clear idea of the solution.

In the following reaction the oxidation state of Mn is changing from +7 to +2.

MnO

4

−

+5e

−

→Mn

2+

Here, 5 moles of electrons are needed for reduction of 1 mole of MnO

4

−

to Mn

2+

As, 5 moles of elctrons=5 Faradays

⟹Quantity of charge required =5×96500=4.825×10

5

Coulomb

Answer 2

Answer:

The number of moles is 24.

The number of electron is 39.