A 3.0 g sample of Na2co3.H2o is heated to a constant mass. how much anhydrous salt remain
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Molecular weight of Na2CO3•H2O is 106 g/mole.
Molecular weight of H2O is 18 g/mole.
The mass fraction of H2O in Na2CO3•H2O is therefore 18/106 = 0.17, or 0.83 Na2CO3 by mass.
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