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It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).

A 30.36 gram sample of a hydrate of MnSO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 27.12 grams of the anhydrous compound remained. What is the formula of the hydrate?

Use a period instead of a dot in the formula of the hydrate.

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