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A sample of an element X contains two is...

A sample of an element X contains two isotopes `._(8)^(16)X and ._(8)^(18)X`. If the average atomic mass of this sample of the element be 16.2 u, calculate the percentage of the two isotopes in this sample.

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`""_(8)^(16)A=90%, ""_(8)^(18)A=10%`
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