Chemistry Isotopes Solution: An unknown element, X, has three naturally occurri...

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Solution: An unknown element, X, has three naturally occurring isotopes. The masses of the threee isotropes are 22.356, 23.492, and 26.106. The first two have a percent abundance of 55.230% and 28.015%, respectively. What is the average mass of the element? A) 23.303 B) 26.242 C) 23.986 D) 18.929 E) 24.934