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Homework Help: Giving the IUPAC name for Al2(Cr2O7)3 ?

  1. May 8, 2012 #1
    1. The problem statement, all variables and given/known data

    I dont understand how to do this. There is 2 of them I am not sure of?

    1st: As2S3 - Is the correct IUPAC name: DiAresenic Trisulfide?

    2nd: Al2(Cr2O7)3 - IS it DiAluminum ... Need help with this. How do you get the IUPAC name from this. Any help would be great!

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 9, 2012 #2
    1. Since we know sulfur is in a -2 oxidation state, that means arsenic is +3. So you could call it either arsenic trisulfide or arsenic (III) trisulfide.

    2. Aluminum is always +3, and dichromate is always -2, so the name is aluminum dichromate.
  4. May 9, 2012 #3
    I am still having trouble with As2S3

    How do we know sulfur is in a -2 oxidation state? And how does Arsenic get a +3

    How does that turn into Arsenic Trisulfide?

    Really appreciate help on this! Thanks.
  5. May 10, 2012 #4
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