Anyone Up Late? Need Help With Chemistry :)

Discussion in 'After Hours Lounge (Off Topic)' started by Henry Carmona, Feb 12, 2004.

  1. Henry Carmona

    Henry Carmona Screenwriter

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    Henry Carmona
    How do i figure this:

    Calculate the number of oxygen atoms in 29.34 grams of sodium sulfate, Na2SO4?

    I hate chemistry [​IMG]

    Anyway, Na=22.99 S=32.07 & O=16.00


    I know that if it was just asking how many atoms in 1 mole i could just multiply Oxygen by 4 correct?

    That is, (4)(avagadros number) = # of O atoms.

    Thanks!
     
  2. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    It's been 17 years but I'll try.

    1 mole of Na2SO4 is
    (2 * 22.99) + (32.07) + (4 * 16.00) = 142.05 grams per mole

    So 29.34 grams of it is 29.34/142.05 = 0.2065 mole of Na2SO4

    4 Oxygen atoms per Na2SO4 molecule * 0.2065 mole of Na2SO4 = 0.8262 mole of Oxygen atoms

    "Avocado's number" is 6.02e23 atoms per mole
    6.02e23 atoms per mole * 0.8262 mole = 4.97e23 atoms

    Somebody check my work please.
     
  3. Scott_J

    Scott_J Cinematographer

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    Checking Wayne's work, the numbers are correct and the method seems to be right as well (although it's been a few years since I took Chem).
     
  4. Scott_MacD

    Scott_MacD Supporting Actor

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    Correctamundo, Wayne.

    It's been a while for me too. [​IMG]
     
  5. Mark Fitzsimmons

    Mark Fitzsimmons Supporting Actor

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    Do you know the factor label method? Its the easiest way to do these types of problems.

    BTW, this is high school chemistry right?
     
  6. Wayne Bundrick

    Wayne Bundrick Cinematographer

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    For me, it was first year high school chemistry, right about this time of the year in fact.

    When I said it's been 17 years that got me thinking. I've reached the age where I've been out of school longer than I was in school, not counting college. I've reached the Middle Ages!
     
  7. Ryan Wishton

    Ryan Wishton Screenwriter

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    I took Chemistry for a year... Got an A in the class both times... The weird thing is if you showed me anything now, I wouldnt know what to do with it... Same with all those math formulas...

    Like High School entirely, I barely remember a thing...

    Terrible memory maybe??? Maybe I have amnesia???

    I tend to only remember things that interest me...
     

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