Answer to Question #350510 in Chemistry for name

Question #350510

There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 12.01%. The percentage of the X-21 isotope is 87.99 % What is the contribution (in amu) to the weighted average from the X-21 isotope, which has a mass of 21.00 amu?

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