Question: please give exact answer with details on how to solve it What is the atomic weight of an element if it has 4 isotopes: Isotope

please give exact answer with details on how to solve it

What is the atomic weight of an element if it has 4 isotopes: Isotope 1 has a mass of 64.987 and an abundance of 0.25000, Isotope 2 has a mass of 66.976 and an abundance of 0.33000, Isotope 3 has a mass of 68.886 and an abundance of 0.22000, Isotope 4 has a mass of 70.785 and an abundance of 0.20000 ? Report to 5 significant figures. Don't round until the end, this requires the exact

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