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A fictitious element X is composed of 70.0 percent of the isotope X^55, 20.0 percent of the isotope X^ 56, and 10.0 percent of the isotope X^57. Calculate the weighted atomic mass of element X to the nearest tenth. You must show all of your work to earn credit.

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Rinkhals

We know that Weighted atomic mass of Element is Calculated based upon their existence of isotopes and the Relative abundance of these isotopes.

Given that the Element X is Composed of :

Isotope                       Relative abundance                   Atomic Mass

⁵⁵X                                        70%                                               55

⁵⁶X                                        20%                                               56

⁵⁷X                                        10%                                                57

Weighted Atomic Mass of Element X :

= (0.70)(55) + (0.20)(56) + (0.10)(57)

= 38.50 + 11.2 + 5.70

= 55.4

So, the Weighted Atomic Mass of Element X is 55.4

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