Question

Calculate the atomic mass (average) of chlorine using the following data :

	% Natural Abundance	Molar Mass
${}^{35}Cl$	75.77	34.9689
${}^{37}Cl$	24.23	36.9659

Answer 1

Average atomic mass of chlorine $=\frac{75.77\times 34.9689+24.23\times 36.9659}{100}=35.45$ g/mol.