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mikeyandr...

M¢25 Funded By Mahalo ? | November 02, 2009 06:25 PM

Chlorine has 2 isotopes and . These have atomic masses 34.9689 amu and 36.9659 amu respectively. Their ratio in nature is 75.77 percent a

nd 24.23 percent respectively. Calculate the average atomic mass?

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opher

November 02, 2009 06:45 PM

The contribution from the lighter isotope is:
34.9689 AMU x 0.7577 = 26.4959 AMU

The contribution from the heavier isotope is:
36.9659 AMU x 0.2423 = 8.9568 AMU

The average atomic mass is the sum of the two contributions which is
(26.4959 + 8.9568) AMU = 35.4527 AMU

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