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chemistry

A 15.67gsample of hydrate of magnesium carbonate was carefully heated, without decomposing the carbonate to drive off water. The mass was reduce to 7.58g. What is the formula of the hydrated?

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  1. 15.67g = mass MgCO3.xH2O
    -7.68 g = mass MgCO3
    --------
    xxxxx = mass H2O

    mols H2O = grams/molar mass
    mols MgCO3 = grams/molar mass
    Find ratio of 1 mol MgCO3 to x mols H2O. That will be the empirical formula of the hydrate.

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