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Ways of Representing the Concentration of a Solution

The absolute ...

Question

The absolute abundance ratio of $N^{14} / N^{15}$ in atomspheric nitrogen was found to be $272$ . Calculate at. wt. of atmospheric nitrogen.

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Solution

Average mass $= \frac{\sum x_{i} m_{i}}{\sum x_{i}} = \frac{272 \times 14 + 15}{273}$
$= 14.0036$
$≃ 14$
Hence answer is $14$

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