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chemistry

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Washing soda, a compound used to prepare hard water for washing 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·x H2O, where x is the number of moles of H2O per mole of Na2CO3. When a 2.228 g sample of washing soda is heated at 125°C, all the water of hydration is lost, leaving 0.825 g of Na2CO3. What is the value of x?

  • chemistry -

    mass water expelled is
    2.228-0.825 = ?, then
    mols H2O = ?g/18 = ?
    0.825/molar mass Na2CO3 = ?
    Now find the ratio of the two. This USUALLY is done to make Na2CO3 = 1.00 and x some whole number.

  • chemistry -

    179.87

  • chemistry -

    .009

  • chemistry -

    128.5

  • chemistry -

    the correct answer is 10 for anyone that comes here
    just got it right on webassign

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