[skibum143]

Dissolving one mole of salt in water yields five moles of ions in which of the following?

 A: NH4[Pt(NH3)Cl3]
 B: tris(ethylenediamine)cobalt(III) sulfate
 C: tetraaquadichloronickel(IV) chloride
 D: [Co(NH3)2(en)Cl2]Cl
 E: [Co(en)2Cl2]Br
 F: sodium hexacyanoferrate(II)
 None of these compounds

Do the ions outside the bracket count? If so, I see five in A. (NH4+, PT+2, 3Cl-) If not, I don't see any? I can't get this one right...

[Schrödinger]

All those inside the square bracket shouldn't be counted separately.

So, for the first one, the ions that are present in the solution are NH₄ ⁺ and [Pt(NH₃)Cl₃]^-.

So, now I believe you can go on and try the other ones