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Chemistry Asked by a SnapAndSolve user · about 2 hours ago

Mass of hydrated calcium sulfate: 3.211g 2. Mass of the anhydrous calcium sulfate: 2.539g 3. Moles of water: ?

1. Mass of hydrated calcium sulfate: 3.211g
2. Mass of the anhydrous calcium sulfate: 2.539g
3. Moles of water: ?
4. Moles of calcium sulfate: ?
5. Mole ratio of water to calcium sulfate: ?
6. Formula of hydrated calcium sulfate: ?

Answer

  1. Mass of hydrated calcium sulfate: 3.211g

  2. Mass of the anhydrous calcium sulfate: 2.539g

  3. Moles of water: Calculate using the mass of water (3.211g - 2.539g = 0.672g) and the molar mass of water (18.015 g/mol):
    Moles of water = 0.672g / 18.015 g/mol = 0.0373 mol

  4. Moles of calcium sulfate: Calculate using the mass of anhydrous calcium sulfate (2.539g) and the molar mass of calcium sulfate (136.14 g/mol):
    Moles of calcium sulfate = 2.539g / 136.14 g/mol = 0.0186 mol

  5. Mole ratio of water to calcium sulfate: 0.0373 mol water / 0.0186 mol calcium sulfate ≈ 2:1

  6. Formula of hydrated calcium sulfate: CaSO₄·2H₂O

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