chemistry problem need help please.?

Question

Bromine has two naturally occurring isotopes (and ) and has an atomic mass of 79.904 . The mass of is 80.9163 , and its natural abundance is 49.31%.

Calculate the mass of Br-79 .

Answer 1

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79.904 = 0.4931 x 80.9163 + (1 - 0.4931) x Y

solve for Y...