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Water molecule in chemical formulas of inorganic compounds

  1. Apr 28, 2015 #1
    In chemical formulas of various inorganic compounds there are molecules of water .I wanted to know is it important to remember the number of moles of water in chemical formulas of inorganic compounds.
     
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  3. Apr 28, 2015 #2

    Borek

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    Staff: Mentor

    Depends. Some compounds - like copper sulfate - are so often used used as hydrates, that remembering their formula is a must (pentahydrate for copper sulfate). Other compounds can exist in many forms (calcium chloride can be prepared as dihydrate, tetrahydrate and hexahydrate) and remembering them all is not necessary.
     
  4. Apr 29, 2015 #3

    DrDu

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    What is certainly important is to remember that there may be water around when calculating the molar mass.
     
  5. Apr 29, 2015 #4

    Borek

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    Staff: Mentor

    Pretty good point.
     
  6. Apr 29, 2015 #5
    You mean to say that we include number of moles of water while calculating molar mass of compounds,right?
     
  7. Apr 29, 2015 #6

    Borek

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    Staff: Mentor

    Yes. Say, you need 1 mole of copper and you have copper sulfate pentahydrate. What mass of the solid do you need?
     
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