What are the formulas of the hydrates? A sample of green crystals of Nickel (II) Sulfate heptahydrate was heated carefully to produce bluish green nickel (II) sulfate hex hydrate. If 8.753 g of the heptahydrate produces 8.192 g of the hex hydrate, determine the numbers of grams of the anhydrous nickel(II) sulfate could be obtained?