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Calculate the atomic weight (in amu) of an element (X) given the following data: 24X: 24.000 amu at 0.7870 fractional abundance 26X: 26.000 amu at 0.1017 fractional abundance 25X: 25.000 amu at 0.1113 fractional abundance

Chemistry
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multiply each isotopes mass by it's percent/fractional abundance (to get the weighted average) and add them all up, like this: (mass of isotope #1) x (% abundance) + (mass isotope #2) x (% abundance) +... = atomic weight
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