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there are 3 naturally occurring stable isotopes of oxygen:O-16,O-17, O-18. there are 2 naturally occurring stable isotopes of hydrogen: H-1, many different water molecules can be made using the various combination's of all the isotopes of hydrogen and oxygen?

  • Mathmate, Reiny, Bob Pursley -

    I'm not good at counting these things. You really need a math man to answer this; however, I count 9. Maybe Mathmate, Reiny, or Bob Pursley will do this right.

  • chemistry -

    You need two H, one O

    ways: 3*2*2=12 Three choices on O, two choices each H.

  • chemistry -

    I hate to be dense about this BUT, I can't count but 9.
    1 1 16
    1 1 17
    1 1 18

    1 2 16
    1 2 17
    1 2 18

    2 2 16
    2 2 17
    2 2 18

    2 1 16
    2 1 17
    2 1 18
    Which gives 12; however, the last three, considering that they are H2O molecules, are the same as set #2 but reversed. It doesn't make a new molecule of H2O, so I still count only 9.

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