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Can someone help me to answer this correctly, please, and explain it It is often possible to change a hydrate into an anhydrous compound by

Can someone help me to answer this correctly, please, and explain it

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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 37.56 gram sample of a hydrate of Na2CrO4 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 17.78grams 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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