THIS NEEDS TO BE FILLED OUT

1.) Coefficient; 3

Subscript to Mg; None (1)

Subscript to Cl; 2

2.) Coefficient; none (1)

Subscript to V; 2

Subscript to O; 5

3.) Coefficient; 4

Subscript to K; 2

Subscript to C; None (1)

Subscript to O; 3

3.) Coefficient; None (1)

Subscript to Na; None (1)

Subscript to C; 2

Subscript to H; 3

Subscript to O; 2

Explanation:

The coefficient is the first big number and the subscript is the smaller number after the element.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

your parents i think this could be it