Question

How many ions are there in a solution with 9.656 mol of `Ni^(2+)`?

Answer 1

Clearly there are `9.656` `mol` of `Ni^(2+)`. But `Ni^(2+)` is not the only ion present.

Explanation:

How do I know this? Because `Ni^(2+)` must have a counterion. This could have been halide, or nitrate, or acetate, or something else.

The number of `Ni^(2+)` ions is `N_A` `xx` `9.656` `mol`. `N_A` is Avogadro's number `=` `6.022xx10^23*mol^-1`. So the number of ions is rather large.