Rod #5

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How to determine the mass percent of water in a hydrate and how to determine the molecular formula of hydrate?

My hydrate is CuSO4 x nH20

Mass of the empty beaker, stirring rod = 235.54g
Mass of the empty beaker, stirring rod, and hydrated CuSO4 = 240. 56g
Mass of the empty beaker, stirring rod, and anhydrous CuSO4 = 229.70g

Please don't give me just the answer or the calculations, I would like the actual explanations so I can learn how to do this myself. Thanks in advance.
The last number is actually 229.70g.

I suppose that the last number is239.7 since it would be impossible to do work, the mass of CuSO4 would be negative

determine mass of anhydrous CuSO4 substraying 239.7-235.54 =MH
determine mass of hydrated CuSO4 =240.56-235.54= M

substract MH-M

mass of water (molar mass CuSO4 *(MH-M)/M) =Mwater

number of moles of water is Mwater /18

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