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Molar Mass

The half-life...

Question

The half-life of polonium is $140$ days. In what time will $15$ gram polonium be disintegrated out of its initial mass of $16 g$ ?

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Solution

After 4 half-lives, polonum will be $\frac{1}{16} t h$ will be left. Therefore, 15 gm will be disintegrated.
Therefore, time= $4 \times 140 = 560$ days

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