Posted by Navroz on Saturday, October 23, 2010 at 6:29pm.
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, H-2.how many different water molecules can be made using the various combination's of all the isotopes of hydrogen and oxygen?
Mathmate, Reiny, Bob Pursley - DrBob222, Saturday, October 23, 2010 at 6:35pm
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 - bobpursley, Saturday, October 23, 2010 at 8:51pm
You need two H, one O
ways: 3*2*2=12 Three choices on O, two choices each H.
chemistry - DrBob222, Saturday, October 23, 2010 at 10:32pm
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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