A sample of element X contains 69 % of 63X and 31 % of 65X.What is the relative atomic mass of X in this sample?A. 63.0B. 63.6C. 65.0D. 69.0
Question
Solution 1
The relative atomic mass of an element is calculated by taking the weighted average of the atomic masses of its isotopes. The weight of each isotope is its abundance.
In this case, element X has two isotopes: 63X and 65X. The abundance of 63X is 69% and the abundance of 65X is 31%.
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