[Forces42]

If the anhydrous compound (AC) in the preceding problem has a molar mass of 160 g/mol, what are the water of crystallization (X) and formula for the hydrate?

I thought in order to find the unknown I would need to know the amount of hydrate  in the unknown?

This what I have so far

___g H₂O X 1 mol H₂O/18.02g H₂O

and

(X) x 1 mol AC/160 g/mol

[lancenti]

I'm not too sure exactly what you're trying to do, but if we take Copper (II) Sulfate as an example, it goes something like this:

CuSO₄ (s) is anhydrous whereas CuSO₄.xH₂O (s) is your hydrated compound. It's a matter of forming the right equation at this point since I suspect the preceding problem allowed you to calculate other important values. I don't know exactly what they gave, so I can't give you a more detailed answer.

[Borek]

in the preceding problem

We don't know the preceding problem and the information given is not enough to solve the question.