How many moles of chlorine (cl) atoms are in a sample of 1.72 × 1022 atoms?
a. 0.0286 mol cl
b. 35.0 mol cl
c. 1.03 × 1023 mol cl
d. 1.04 × 1046 mol cl

0.0286 mol Cl

Explanation:

to convert atoms to moles, we need Avogadro's number.

1 mol= 6.02 x 10^23 atoms

1.72 x 10^22 atoms (1 mol/ 6.02 x 10^23)= 0.0286 moles