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Need help with ADP.

  1. Nov 24, 2003 #1
    what is the net charge for adp?(i'm guessing its zero since it is a molecule)

    what is the formal charge of the oxygen(the one forming a double bond with phosphate)?

    can someone give me a quick reply. thanx.
     
    Last edited: Nov 24, 2003
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  3. Nov 24, 2003 #2

    Monique

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    I think:

    Net charge ADP: -3
    Net charge ATP: -4

    I am not sure about the formal charge..
     
  4. Nov 24, 2003 #3

    Another God

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    what is a formal charge?
     
  5. Nov 24, 2003 #4

    Monique

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    Formal charge:

    (# valence e-) - (# non-bonding e- + 1/2 # bonding e-)

    you figure that one out :P
     
  6. Nov 24, 2003 #5

    Monique

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    Actually, looking at it.. it is not so difficult.

    Oxygen has 6 valence electrons.

    Determine the number of nonbonding electrons and add to that the number of bonding electrons (half will belong to the O). If this number is 6, then O has a formal charge of 0. If this number is 8, O has a formal charge of -2.

    But before being able to calculate anything, you'd have to write down the Lewis structure first.
     
  7. Nov 24, 2003 #6
    thanx for reply guys.
    but not really sure about the -3 for adp.
    i'm expecting zero for net charge.
    and the formal charge of oxygen to be zero( 2 lone pair, and a double bond)

    2 lone pair + 1 double bond = 8e

    2 lone pair + .5 double bond = 6e

    Formal charge of oxygen:

    (# valence e-) - (# non-bonding e- + 1/2 # bonding e-)

    (6 valence e) - (4 non-bonding e + .5(4 bonding e)) = 0
     
  8. Nov 24, 2003 #7
    adp have a net charge of zero. but when it bind with Ba (i think is Ba , not exactly sure), it will lose 3H, hence it will then have a net charge of -3.

    i think the net charge of -3 probably is one that exist in nature.
     
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