Question

what is the relative atomic mass of bromine if its 2 isotopes 79Br and 81Br exist in equal amounts.
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Answer 1

Answer:

80

Explanation:

If total bromine percentage is %

(79×50 + 81 ×50)/100 = 80

Second method (Use only when ghe isotopes are in equal amount)

Just take average bro...

(79+81)/2 = 80

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