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18 June, 02:25

Gypsum is hydrated calcium sulfate. a 4.89 g sample of this hydrate was heated. after the water was removed, 3.87 g anhydrous calcium sulfate remained. determine the formula of this hydrate and name the compound.

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  1. 18 June, 02:37
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    Answer is: c alcium sulfate dihydrate (CaSO₄ · 2H₂O)

    m (CaSO₄ · xH₂O) = 4,89 g.

    m (CaSO₄) = 3,87 g.

    n (CaSO₄) = m (CaSO₄) : M (CaSO₄)

    n (CaSO₄) = 3,87 g : 136 g/mol = 0,0285 mol.

    m (H₂O) = m (CaSO₄ · xH₂O) - m (CaSO₄).

    m (H₂O) = 4,89 g - 3,87 g

    m (H₂O) = 1,02 g.

    n (H₂O) = m (H₂O) : M (H₂O)

    n (H₂O) = 1,02 g : 18 g/mol

    n (H₂O) = 0,057 mol.

    n (CaSO₄) : n (H₂O) = 0,0285 mol : 0,057

    n (CaSO₄) : n (H₂O) = 1 : 2
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