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Atomic Number

If bromine at...

Question

If bromine atom is available in the form of say, two isotopes $_{35}^{79} B r$ (49.7%) and $_{35}^{81} B r$ (50.3%). Calculate the average atomic mass of bromine atom.

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Solution

Average atomic mass of $B r$ =[ $A t o m i c m a s s o f B r_{35}^{79} \times p e r c e n t a g e$ + $A t o m i c m a s s o f B r_{35}^{81} \times p e r c e n t a g e$ ]/100

=[ $79 \times 49.7$ + $81 \times 50.3$ ]/100

= $80.006 u$

The correct answer is = $80.006 u$

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Q. Question 10
If bromine atom is available in the form of, say, two isotopes

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