The reaction Fe3O4 +C ---> CO2 + Fe can be balanced with the coefficients: 1,4,4,3
2.4.4.3
1,2,2,3
O 1,1,1,3

the answer is 1,2,2,3

Explanation:

Fe3O4 +C ---> CO2 + Fe

1Fe3O4 +2C ---> 2CO2 + 3Fe

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).