Determining the formula of a hydrate.

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When all of the water of hydration was driven off of 4.32g of a hydrate of compound Z, the residue, the anhydrous form of Z, had a mass of 3.09g. What is the formula of the hydrate (using the symbol Z as part of it)? The formula mass of Z is 90.0

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When all of the water of hydration was driven off of 4.32g of a hydrate of compound Z, the residue, the anhydrous form of ...

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The expert determines the formula of a hydrate.

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