The two natural isotopes of chlorine viz.
The two natural isotopes of chlorine viz. \(_{17}^{35}Cl\) and \(_{17}^{35}Cl\) exist in relative abundance of 3 : 1. Find out the average atomic mass of chlorine.
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Given :
Isotopes of chlorine \(_{17}^{35}Cl\) and \(_{17}^{35}Cl\).
Ratio of relative abundance of these isotopes is 3 : 1.
To find :
Average atomic mass of chlorine
Calculation :
From the relative abundance 3 : 1, it is understood that out of 4 chlorine atoms, 3 atoms have mass 35 and 1 atom has mass 37.
Therefore,
The average atomic mass of chlorine = \(\frac{3\times 35+1\times 37}{4}\)= 35.5
∴ Average atomic mass of chlorine = 35.5 u
The average atomic mass of chlorine is 35.5 u.
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