Magnesium sulphate crystals (MgSO4.7H2O) can be dehydrated by heating . Calculate the percentage by mass of water present in the molecule.
Magnesium sulphate crystals (MgSO4.7H2O) can be dehydrated by heating . Calculate the percentage by mass of water present in the molecule.
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Answer:
51.2
Explanation:
Relative molecular mass of MgSO .7H2 O
=24+32+(16×4)+7(2+16)
=24+32+64+126=246
26g of Epsom salt contains 126g of water of crystallisation.
Hence, 100g of Epsom salt contains 100×126/246
The % of H2 O in MgSO4.7H2O = 51.2
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