A hydrated magnesium salt, MgSO4 • × H2O, was heated until all the water of hydration was lost. If a 3.188 g sample of hydrated salt produced 1.558 g of anhydrous salt, the value of × in MgSO4 • × H2O is?

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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".