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It is often possible to change a hydrate into an anhydrous compound by heating it to...

It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration). A 32.61 gram sample of a hydrate of Na2CrO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 15.44 grams of the anhydrous compound remained. What is the formula of the hydrate?

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