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Jennifer was a pre-pharmacy student and enrolled in general chemistry laboratory. One day the lab instructor asked Jennifer to identify a hydrate on the shelf labeled A, B, C, and D. They were possibly CaSO4 • 2H2O, CaCrO4 • 2H2O, AlCl3 • 6H2O, and ZnSO4 • 7H2O. Jennifer weighed 1.485 g of a hydrate. After heating/weighing three times, she finally obtained 0.820 g of the anhydrous compound. Jennifer concluded the hydrate was ZnSO4 • 7H2O. Was Jennifer’s finding correct? Why?