Question

How many moles of chlorine (Cl) atoms are in a sample of 1.72 x 1022 atoms?

Answer 1

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

Answer 2

Answer: 0.027 moles of Chlorine atoms are present in a sample of $1.72\times 10^{22}$ atoms.

Explanation: According to the mole concept,

1 mole has $6.022\times 10^{23}$ number of atoms.

So, $1.72\times 10^{22}$ atoms will have $=\frac{1mol}{6.022\times 10^{23}atoms}\times 1.72\times 10^{22}atoms=0.027moles$

Hence, 0.027 moles of Chlorine atoms will be present.