what percentage of water is found in Na2S . 5H2O
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molecular weight of Na2S . 5H2O=23×2+32+5×18
= 168g
molecular weight of 5H2O= 90g
168g of Na2S . 5H2O contains 90g of H2O
•°• 100g of Na2S . 5H2O contains ? of H2O
= 90×100/168
= 53.57% of water.
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