Explanation:
Number of moles are defined as the mass divided by molar mass.
Mathematically, No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
It is given that mass is 55.98 g and molar mass of [tex]CF_{2}Cl_{2}[/tex] is 120.91 g/mol.
Therefore, calculate the number of moles as follows.
No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
= [tex]\frac{55.98 g}{120.91 g/mol}[/tex]
= 0.462 mol
Thus, we can conclude that there are 0.462 moles present in 55.98g of [tex]CF_{2}Cl_{2}[/tex].
