Question

A sample of unknown nickel chloride hydrate compound, NiCl2·nH2O, weighing 3.311 g was heated strongly to drive off all water. After heating sample weighed 1.805 g. Find mass of water in sample?

I multiplied [(129.599*32.022)/3.311] x (1.805/1) and got 2262.314g, but it didn't seem right to me.

After you find the mole for water and nickel chloride, how do you find this: How many water molecules are there per formula unit of anhydrous metal salt?