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Chemical reaction

  1. Sep 21, 2004 #1

    I got a question regarding chemical reaction:

    3 H2O + 2(CaSO4 . 1/2 H2O) ----> 2 (CaSO4 . 2H20)

    calciumsulfat dihydrat reacting via water.

    My question is:

    If I have 1 Kilogram of calciumsulfat dihydrat how much water is needed ?

    Thanks in advance.


  2. jcsd
  3. Sep 21, 2004 #2


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    Science Advisor
    Gold Member


    You'll first need to calculate how many moles of calcium sulfate dihydrate are equal to one kilogram. Then notice that there is 1,5:1 ratio between water and calcium compound, just do the necessary math to obtain the moles, and find the grams from it. Since the density of water is 1 g/mL at ambient temperature, you can directly find how many mililiters of water will be used in the reaction.

    Hint: one mole of water is equal to eighteen grams, since O:16 g/mol and H:1 g/mol.

    Regards, chem_tr
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