Mass spectrum of chlorine with its relative atomic mass

An example figure from the Mass Spectrum generator.

The mass spectrum of chlorine: a peak at m/z 35 labeled 75.76% and a peak at m/z 37 labeled 24.24%, with an answer key under the graph — The mass spectrum of chlorine, with peaks at m/z 35 and 37 for its two isotopes, chlorine-35 at 75.76% and chlorine-37 at 24.24%, about three to one. The answer key under the graph gives chlorine’s relative atomic mass, the average of the two isotopes’ masses weighted by their abundances.

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Answer key

Chlorine (Cl): relative atomic mass 35.45
Relative atomic mass: (34.969 × 75.76 + 36.966 × 24.24) ÷ 100 = 35.45

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