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    susus's Avatar
    susus Posts: 138, Reputation: 2
    Junior Member
    		  
    #1

    Nov 29, 2010, 06:19 PM
    atoms numbers..
    A sample of ethane, C2H6, contains a total of 16N atoms, where N = 6.02 × 1023. How much C2H6 is in the
    sample?
    a. 2.0 g
    d. 16 mol
    b. 30 g
    e. 4 mol
    c. 60 g

    now this time I did not know how to solve this !
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #2

    Nov 29, 2010, 08:16 PM
    How many atoms are in one ethane molecule? How many would be in one mole of ethane molecules? Which of the possible answers give that number? Give it a try and we will give more help if you need it.
    ilovechem's Avatar
    ilovechem Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Dec 4, 2010, 06:29 PM
    Comment on DrBob1's post
    I have the same problem and I did EXACTLY what you said, but I still don't come up with the key answer of 60 grams??
    ilovechem's Avatar
    ilovechem Posts: 4, Reputation: 1
    New Member
    		  
    #4

    Dec 4, 2010, 06:59 PM
    Comment on DrBob1's post
    actually I think I just figured it out: there are 8 atoms in one molecule of ethane not 6.022 x 10^23 atoms in one ethane molecule. I think that's where I went wrong, right?
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #5

    Dec 4, 2010, 08:27 PM
    Comment on DrBob1's post
    Absolutely correct. Well done!
    ilovechem's Avatar
    ilovechem Posts: 4, Reputation: 1
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    #6

    Dec 5, 2010, 06:13 PM
    Comment on DrBob1's post
    Thanks! :D
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