Atomic Weights from Mass Spectra

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mass (amu)

Mass Spectrum of Chlorine Gas

35Cl

37Cl

35Cl2

35Cl

37Cl

37Cl2

isotope

35Cl

37Cl

abundance

75.77%

24.23%

mass (amu)

34.96885

36.96699

average atomic

weight:

35.453

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