Question

Bromine -79 and bromine -81 are found in nature in the ratio 50.69 and 49.31 .What will be the average atomic weight of bromine?​

Answer 1

Answer:

$br {}^{79} and \: \: br {}^{81} aboundance \: ratio$

( 50.69 : 49.31 ) %

The average atomic weight of bromine can be obtained by multiplying their relative abundance with mass no.

$79 \times \frac{50.69}{100} + 81 \times \frac{49.31}{100} \\ \\ \frac{4004.51}{100} + \frac{3994.11}{100} \\ \\ = 79.98 \: \: or \: app. \: \: 80$

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