Chloe t. followed the procedure of this experiment to determine the empirical formula of a compound of iron (fe) and chlorine (cl). to do so, she added 2.15 g of zn to a solution containing 1.750 g of fe(x)cl(y). after the reaction was complete, she isolated 0.771 g of fe. the mass of cl in the fe(x)cl(y) solution is

Explanation

The sample contains only the atoms of

Thus no matter what natural numbers and are, shall holds.

Recall that zinc is more reactive than iron as seen in the reactivity series;  Adding zinc to the solution would reduce all iron atoms (regardless of the oxidation state, or ) to their elementary form, hence displacing them out of the solution. of iron was obtained and therefore .

Thus

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i believe the answer is three water molecules