Chemistry
Find the percentage mass of water in Epsom salt, MgSO4.7H2O.
Relative Atomic Mass
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Answer
Relative molecular mass of MgSO4.7H2O
= 24 + 32 + 4 x 16 + 7(2 x 1 + 16)
= 24 + 32 + 64 + 126
= 246 amu
246 g of Epsom salt contains 126 g of water of crystallisation
∴ 100 g of Epsom salt contains
= = 51.22 g of water of crystallisation.
∴ % mass of water in Epsom salt, MgSO4.7H2O = 51.22%
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