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A sample of e...

Question

A sample of element X contains 100 atoms with a mass of 12 u and 10 atoms with a mass of 14 u. calculate the average atomic mass of elelment X.

12.18 g

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13.18 g

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13.14 g

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12.14 g

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Solution

The correct option is A 12.18 g
The percentage abundance of X containing 100 atoms = $\frac{100}{110}$ = 90.91%
The percentage abundance of X containing 10 atoms = $\frac{10}{110}$ = 9.09%
So, the average atomic mass of X = $12 \times 0.9091 + 14 \times 0.0909 = 12.18$ g

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