Chemistry, 10.10.2020 01:01 birdman9416

A fictitious element X is composed of 10.0% of the isotope X-55, 20.0% of the isotope X-56, and 70.0% of X-57. Calculate the average atomic mass of element X

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A fictitious element X is composed of 10.0% of the isotope X-55, 20.0% of the isotope X-56, and 70.0...