A hydrate of nickel (II) sulfate has the following formula: NiSO4·X H2O. The water in a 0.250 g sample of the hydrate was driven off by heating. The remaining sample had a mass of 0.171 g. Find the number of waters of hydration (X) in the hydrate.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".