Elemental chlorine consists mainly of two isotopes: $""^35Cl$ of $75%$ abundance; and $""^37Cl$ ... What is the average atomic mass of chlorine?

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Answer 1 · 2017-05-11T07:28:40

About $35.5*"amu"$

Atomic mass is the weighted average of the individual isotopes.

And thus average atomic mass is given by the expression:

$(0.75xx35(""^35Cl) +0.25xx37(""^37Cl))*"amu"=$

$35.5*"amu"$

Elemental chlorine consists mainly of two isotopes: ""^35Cl""^35Cl of 75%75% abundance; and ""^37Cl""^37Cl... What is the average atomic mass of chlorine?