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Naturally occuring chlorine is a mixture...

Naturally occuring chlorine is a mixture of two isotopes. In every sample of this element 75.77% of the atoms are 35Cl and 24.23% are atoms of 37Cl. The accurately measured atomic mass of 35Cl is 34.9689 u and that of 37Cl is 36.9659 u. From these data. Calculate the average atomic mass of chlorine.

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