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Aluminum has a common oxidation state of
For similar reasons, aluminum chloride is
Chlorine and iodine both exist naturally (in their elemental states) as diatomic , so they are
Overall we get:
$2"AlI"_3(aq) + 3"Cl"_2(g) -> 2"AlCl"_3(aq) + 3"I"_2(g)$
Knowing that there were two chlorines on the left, I just found the common multiple of 2 and 3 to be 6, and doubled the
Naturally, now we have two
We should note, though, that aluminum iodide is violently reactive in water unless it's a hexahydrate. So, it's probably the anhydrous version dissolved in water, and the amount of heat produced might explain why iodine is a gaseous product, and not a solid.