Question

Q.6. Mass of an atom of an element A is $3.9854\times {10}^{-23}$ g. How many atoms are contained in 1 g of the element of A?

Answer 1

Dear student,


The mass of 1 atom = 3.9854$\times$10^-23 gm
therfore the mass of 6.02$\times$ 10²³ number of atoms = 3.9854$\times$10^-23 $\times$ 6.02$\times$ 10²³ = 23.99 gm/mol (gram atomic mass )
Now the number of atoms in 23.99 gm is = 6.02$\times$ 10²³
Then the number of atoms in 1 gm of element = 6.02$\times$ 10²³ / 23.99 = 0.25 $\times$10²³ numder of atoms
Regards