Properties of Hydrates?

I am given a sample of a green nickel sulfate hydrate. I weigh the sample in a dry in a dry covered crucible and obtains a mass of 22.326g for cover&sample. Earlier I found that the crucible&covers weigh 21.244g. I heat the crucible to drive off the water of hydration for 10min. the crucible cools and lower mass... show more I am given a sample of a green nickel sulfate hydrate. I weigh the sample in a dry in a dry covered crucible and obtains a mass of 22.326g for cover&sample. Earlier I found that the crucible&covers weigh 21.244g. I heat the crucible to drive off the water of hydration for 10min. the crucible cools and lower mass w/cover weigh 21.840g.in this process the sample converted to yellow anhydrous NiSO4.
What is the % of water in the hydrate?
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