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Homework Help: Nomenclature, molecular mass, moles help (attempted problems already)

  1. Oct 12, 2011 #1
    Alright, below are screen captures of some work that I'm tackling. They show my attempts and answers at the problems. I would like to know whether I'm correct or wrong and how to correct the mistakes. The one I need most help with is, the one where you're given density and asked to find molecules. Help will be greatly appreciated. Thanks in advance.

    http://img811.imageshack.us/img811/6668/molecules.jpg [Broken]

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    http://img18.imageshack.us/img18/9577/nomenclature1.jpg [Broken]

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    http://img845.imageshack.us/img845/9237/nomenclature2.jpg [Broken]

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    http://img27.imageshack.us/img27/3218/mm1nl.jpg [Broken]

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    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 12, 2011 #2

    SteamKing

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    How many grams of water are in one mole? (Hint: review the definition of a mole)
     
  4. Oct 12, 2011 #3
    would I have to calculate it as so:

    H: 2x(1.008)
    O: 1x(16.00)
    --------------
    H2O:18.016 mol H20 ??? and use that instead in the conversion factor?

    What about my other problems. Are they okay?
     
  5. Oct 12, 2011 #4

    SteamKing

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    You still are not understanding the concept of what a mole of a substance is.
     
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