Question

mass of one atom X is 6.642 x 10^-23g.Then what is its atomic mass​

Answer 1

Answer:

As we knowthat1moleofanyatom=6.022*10^23 atoms

Or we can say that 6.022*10^23 atoms have mass=1 mol=atomic mass of that element.

Now mass of one atom= 6.642 *10^-23g

Mass of 6.022*10^23 atoms =

(6.022*10^23)*( 6.642 *10^ -23]

= 39.998124

= 39.9

~40u ..is your ans.