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A hydrated salt MgSO4.xH2O (anhydrous MgSO4 molar mass 120 g/mol,…
Question
A hydrated salt MgSO4.xH2O (anhydrous MgSO4 molar mass 120 g/mol, water 18 g/mol) is heated. A 4.92 g sample of the hydrate loses 2.52 g of mass as water upon complete dehydration to anhydrous MgSO4. Determine the value of x (the number of water molecules per formula unit).
✓ Verified answer: 7checked by our engine — not a guess
Step-by-step solution
Mass of anhydrous MgSO4 = 4.92 - 2.52 = 2.40 g. Moles MgSO4 = 2.40/120 = 0.0200.
Mass of water = 2.52 g. Moles H2O = 2.52/18 = 0.1400.
x = moles H2O / moles MgSO4 = 0.1400/0.0200 = 7.
Final answer7.0
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