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 three isotopes are 54.335, 59.345 and 62.349 The two have a percent abundance of 35.528% and 38.136% respectively. What is the average mass of the element? a. 58.676 b. 65.713 c. 58.481 d. 58.356 e. 58.873