Question

The number of electrons lost in the following change is Fe + H20 - Fe304 + H2​

Answer 1

Answer:

Given the reaction:

Fe+H20 gives Fe3O4+H2

If the number of electrons lost or gained during the changes is x. Then, the value of x is 8.

The balanced chemical equation is as follows:

3Fe+4H20 gives Fe3O4+4H2

The oxidation number of hydrogen changes from +1 (in water) to 0 (in hydrogen molecule).

Thus, net change in the oxidation number of hydrogen per atom is 1.

There are 8 H atoms.

Hence, the total change in the oxidation number of 8 hydrogen atoms is 8.

Hence, 8 electrons are involved in the redox reaction.

Hence, x=8.

Explanation: