How to Calculate the Empirical Formula of a Hydrate?

[unf0r5ak3n]

Homework Statement

Calculate the empirical formula of each hydrate

Homework Equations

Mass of MnSO4 x XH2O...
-Hydrate = 1.8g
-Anhydrous salt = 1.59g
-Water = .21g

The Attempt at a Solution

I thought you would set 1.8g MnSO4*XH2O((Molecular mass of MnSO4)/(Molecular mass of MnSO4*XH2O)), but I am not sure what to do.

 

[Borek]

You have to find the molar ratio between anhydrous salt and water.