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.
A
12.33 g
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B
15.67 g
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C
10.28 g
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D
18.38 g
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Solution
The correct option is A 12.33 g The percentage abundance of X containing 250 atoms = 250300 = 83.33% The percentage abundance of X containing 50 atoms = 50300 = 16.67 % So, the average atomic mass of X = 12×0.8333+14×0.1667=12.33 g