Chlorine exists as two isotopes, (34.9689 u) and (36.9659 u)

CHEMISTRY · Subjective · A Level · Chemistry · Atomic structure · Atomic structure

Problem

Chlorine exists as two isotopes,

^{35}\text{Cl}

(34.9689 u) and

^{37}\text{Cl}

(36.9659 u). A sample of

\text{Cl}_{2}

gas produced in a laboratory has an average atomic mass of 35.22 u. Calculate the number of atoms of

^{37}\text{Cl}

present in 5.00 g of this chlorine gas. Give your answer to three significant figures.