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Chlorine has two isotopes of atomic mass...

Chlorine has two isotopes of atomic mass units `34.97 u and 36.97 u`. The relative abundances of these two isotopes are `0.735 and 0.245` respectively. Find out the average atomic mass of chlorine.

Text Solution

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Atomic mass of first isotope `= 34.97 u`
Relative abundance of first isotope `= 0.735`
Atomic mass of second isotope `= 36.97 u`
Relative abundance of second isotope `= 0.245`
Average atomic mass of chlorine `= ((34.97u)xx0.735+(36.97u)xx0.245)/(0.735+0.245)`
`=((25.703+9.058)u)/(0.980)=35.47u`.
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