Oxygen exists as three isotopes \( { }_{8}^{16} \mathrm{O},{ }_{8}^{17} \mathrm{O},{ }_{8}^{18} ....

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Oxygen exists as three isotopes \( { }_{8}^{16} \mathrm{O},{ }_{8}^{17} \mathrm{O},{ }_{8}^{18} \mathrm{O} \) with
\( \mathrm{P} \)
relative abundance \( 90 \%, 7 \% \) and \( 3 \% \) respectively, then
W
average atomic mass of oxygen is
(1) \( 16.13 \mathrm{amu} \)
(2) \( 17 \mathrm{amu} \)
(3) \( 17.2 \mathrm{amu} \)
(4) \( 18.13 \mathrm{amu} \)


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