percentage composition of CaSO4 in CaSO4.2H2O
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Answer:
79%
Explanation:
Mass of Ca = 40
Mass of Sulphur, S = 32
Mass of Oxygen, O = 16
Mass of CaSO₄ = 40 + 32 + (4 * 16) = 40 + 32 + 64 = 136 u
Mass of CaSO₄.2H₂O = 40 + 32 + (4 * 16) + 2(2 * 1 + 16) = 136 + 36 = 172 u
Mass percent of CaSO₄ in CaSO₄.2H₂O =
Mass of CaSO₄ / Mass of CaSO₄.2H₂O * 100
= 136 / 172 * 100 = 79%
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