An average sample of chlorine contains 75.77% chlorine-35, with an atomic mass of 34.969 amu (atomic mass units), and 24.23% chlorine-37, with an atomic mass of 36.966 amu. What is the average atomic mass of chlorine?

Md Ariful Islam

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Md Ariful Islam

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The weighted average is the sum of each individual nuclide, multiplied by its isotopic abundance.

So, we simply do the arithmetic:

$0.7577xx34.969+0.2423xx36.966 = ???$ amu

Then look at to see how accurate your result is.

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