Question

the mass of an atom of lead [pb=202]

Answer 1

202 amu is the average weight of a single lead atom.

We can also write 202 grams as the weight of an Avogadro's number of lead atoms.  

If you want the weight in grams of an average lead atom, simply divide the average atomic weight by Avogadro's number.

That is,  

Mass of 6.022x10²³ Pb atoms = 202g

Mass of 1 Pb atom = 202/6.022x10²³

The answer will be= 33.5x10⁻²³g

Answer 2

Answer:

= 202/6.023×10^23

= 33.5*10^-23