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Q.

An element exist in nature in two isotopic forms: $X^{32} (60 %)$ and $X^{34} (40 %)$ .What is the average atomic mass of element ?

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answer is 33.

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Detailed Solution

$M_{a v e r a g e} = \frac{32 \times 60 + 34 \times 40}{100} = 32.8$

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