A sample of element Y contains 250 atoms with a mass of 12 u and 50 atoms with a mass of 14 u. Calculate the average atomic mass of element X.

12.33 g

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15.67 g

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10.28 g

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18.38 g

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Solution

The correct option is A 12.33 g
The percentage abundance of X containing 250 atoms = $\frac{250}{300}$ = 83.33%
The percentage abundance of X containing 50 atoms = $\frac{50}{300}$ = 16.67 %
So, the average atomic mass of X = $12 \times 0.8333 + 14 \times 0.1667 = 12.33$ g

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The simplest formula of a compound containing $50 %$ of element X (atomic mass 10) and $50 %$ of element Y (atomic mass 20) is

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