Question

Calculate the number of atoms in a 5.31 x 10³ g sample of sodium. number of atoms:

Answer 1

Answer:

        no of atoms =   13.9 x 10^25

Explanation:

                No. of moles = mass of compound / molar mass of   compound

   

       As ; mass of sodium = 5.3 x 10^3 g

       

        Molar mass of sodium = 22.9 g/ mol

         

        putting values  

         

         n = 5.3 x 10^3 / 22.9

       

         n = 231.4 mol

Also; no of mol (n) = no of particles / Avagadros number

               so no of particles = n x Avagadros no.

     

               put n = 231.4 and Avagadros no = 6.023 x 10^23

 

                 no of particles = 231.4 x 6.023 x 10^23

                                   =   13.9 x 10^25