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Washing soda crystals have the formula Na2CO3.xH2O (anhydrous Na2CO3…
Question
Washing soda crystals have the formula Na2CO3.xH2O (anhydrous Na2CO3 molar mass 106 g/mol, water 18 g/mol). On complete dehydration, a 2.86 g sample of the crystals leaves 1.06 g of anhydrous Na2CO3. Determine x.
✓ Verified answer: 10checked by our engine — not a guess
Step-by-step solution
Moles anhydrous Na2CO3 = 1.06/106 = 0.0100.
Mass of water = 2.86 - 1.06 = 1.80 g; moles H2O = 1.80/18 = 0.100.
x = 0.100/0.0100 = 10.
Final answer10.0
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