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Question

As many as ______ different combinations of water are possible from H11,H21,H31,O168,O178,O178 ?

A
16
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B
5
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C
18
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D
24
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Solution

The correct option is C 18
Different combinations can be used in the preparation of water. Using these isotopes, a total of 18 combinations are possible. At first it might seem that kinds of water with the chemical structure H2O based on isotope differences only, are 9 in number:

H12O16,H22O16,H32O16,
H12O17,H22O17,H32O17,
H12O17,H22O18,andH32O18

However, there are actually 18 differing isotope kinds of water. This is because each of the two hydrogen atoms in a particular molecule can be a different isotope, giving these 9 additional varieties of water:

H1H2O16,H1H3O16,H2H3O16,
H1H2O17,H1H3O17,H2H3O17,
H1H2O18,H1H3O18,andH2H3O18


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