Question

Explain why chlorine whether as the element or its compounds, always has relative atomic mass of about 35.5.

July 12, 2024

Answer

The relative atomic mass is the average mass of one of the atoms and has to take into account the relative abundances of the various isotopes.

Natural chlorine always contains about ${3\over4}\times_{17}Cl^{35} and {1\over4} \times_{17}Cl^{37}$

Therefore, relative atomic mass of chlorine = ${3\over4}\times35 + {1\over4}\times 37$

=35.5 u

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