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Washing soda, a compound used to prepare hard water for laundry, is a hydrate, which means...

Washing soda, a compound used to prepare hard water for laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3.xH2O, where x is the number of moles of H2O per mole of Na2CO3. When a 1:791-g sample of washing soda is heated at 25 degrees Celsius, all the water of hydration is lost, leaving 0.664g of Na2CO3.

What is the value of x?

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