Question:
A 3g sample of NaCO3.10H2O is heated to constant mass. How much anhydrous salt remains
Answer:
Molecular weight of Na2CO3•H2O = 106 g/mole.
Molecular weight of H2O = 18 g/mole.
Na2CO3•H2O (total) = 106 + 18 = 124.0 g/mol
Percentage of anhydride = (106/124) X 100 = 85.484%
Mass of anhydride = 0.85484 X 3.0 = 2.6g
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