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.
A
12.18 g
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B
13.18 g
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C
13.14 g
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D
12.14 g
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Solution
The correct option is A 12.18 g The percentage abundance of X containing 100 atoms = 100110 = 90.91% The percentage abundance of X containing 10 atoms = 10110 = 9.09% So, the average atomic mass of X = 12×0.9091+14×0.0909=12.18 g