The fully hydrated form of sodium sulfate is the decahydrate, Na₂SO₄. 10H₂O.This compound dehydrates (loses some waters of hydration)when heated.A sample of partially dehydrated sodium sulfate was found to have a molar mass of 232.1 g/mol.How many water molecules are found $\underline{\text{ per formula unit }}$ in in this sample? (i.e.determine n in Na₂SO₄.nH₂O).

Question

Quizplus · Accepted Answer

The molar mass of Na2SO4 is 142.04 g/mol. The molar mass of H2O is 18.02 g/mol. The molar mass of the partially dehydrated sodium sulfate is 232.1 g/mol. Therefore, the number of water molecules per formula unit is (232.1 g/mol - 142.04 g/mol) / 18.02 g/mol = 5.

The Fully Hydrated Form of Sodium Sulfate Is the Decahydrate per formula unit ‾\underline{\text{ per formula unit }} per formula unit ​

The Fully Hydrated Form of Sodium Sulfate Is the Decahydrate $\underline{\text{ per formula unit }}$