The third ionization energy of bromine is the energy required for which of the following processes?

br(g) ? br+(g) + e?
br+(g) ? br2+(g) + e?
br(g) ? br2+(g) + 2e?
br(g) ? br3+(g) + 3e?
br2+(g) ? br3+(g) + e?

Explanation:

1) The first ionization energy is the energy required to release an electron from a gas neutral atom.

Hence, this is the energy required for this process:

2) The second ionization energy is the energy required to release an electron from a gas ion with charge 1+.

Hence, this is the energy required for this process:

3) The third ionization energy is the energy required to release an electron from a gas ion with charge +2.

Hence, this is the energy required for this process:

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 !