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Chemical reaction

  1. Sep 21, 2004 #1
    Hi

    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.

    Sincerely

    Fred
     
  2. jcsd
  3. Sep 21, 2004 #2

    chem_tr

    User Avatar
    Science Advisor
    Gold Member

    Hello,

    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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