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

It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).
A 35.65 gram sample of a hydrate of Na2SO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 15.72 grams of the anhydrous compound remained. What is the formula of the hydrate?
It is often possible to change a hydrate into an anhydrous

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