Oxygen occurs in nature as a mixture of isotopes ${ }^{16} \mathrm{O},{ }^{17} \mathrm{O}$ and ${ }^

Question

Oxygen occurs in nature as a mixture of isotopes ${ }^{16} \mathrm{O},{ }^{17} \mathrm{O}$ and ${ }^{18} \mathrm{O}$ having atomic masses of $15.995 u$ , $16.999 u$ and $17.999 u$ and relative abundance of $99.763 \%, 0.037 \%$ and $0.200 \%$ respectively. What is the average atomic mass of oxygen?\

Professor PC Thomas Classes · Answer

(a) : Average atomic mass of oxygen\ $=\frac{(99.763 	imes 15.995)+(0.037 	imes 16.999)+(0.200 	imes 17.999)}{100}$\
= 15.999u