Homework Help: chem

Posted by Jenny on Thursday, April 2, 2009 at 12:50am.

A 3.48 gram sample of sodium sulfate hydrate lost 1.35 gram of water when heated to constant weight. What is the formula of the hydrate?

this is what I did, but I am stuck.
Na2SO4 . H2O------> NA2SO4+H20

chem - DrBob222, Thursday, April 2, 2009 at 11:42am
So the mass of water is what? The loss due to water is the 1.35. How much is left?
3.48 - 1.35 = ?? must be the mass of the anhydrous Na2SO4.
So determine moles Na2SO4 and moles H2O. Convert those moles to small whole numbers just as if you had a percentage problem and want to know the empirical formula.

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