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Well, the CI atomic number is 17. The Atomic Mass is 35.4527 amu.
There are two stable isotopes of chlorine with relative mass numbers 35 and 37. As the relative abundance of these isotopes are 75% and 25% respectively, the molar mass of chlorine is considered as 35.5 g/mol.

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11y ago
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14y ago

35 and 37 for the two stable isotopes (25% resp. 75%)

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11y ago

For the determination of the atomic weight (not mass) of chlorine we need to know the isotopic composition of Cl and the atomic masses of the isotopes.

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6y ago

Chlorine-35 has the mass number 35.
Chlorine-37 has the mass number 37.

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Q: How do you determine the atomic mass of chlorine?
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