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  4. Oxygen contains 90 % O16 and 10 % O18 . Its atomic mass is

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Q. Oxygen contains $ 90\%\,O^{16}$ and $10\% \, O^{18}$ . Its atomic mass is

Punjab PMETPunjab PMET 2001

Solution:

Oxygen have $90 \% O ^{16}$ and $10 \% O ^{18}$
$\therefore $ Atomic mass
$=\left[\frac{90}{100} \times 16+\frac{10}{100} \times 16\right]$
$=\frac{1440+180}{100}=\frac{1620}{100}=16.2$