Question

One atom of an element 'X' weighs 6.644 ? 10^-23 g. Calculate the number of gram atoms in 80 kg of it.

Answer 1

Dear student

weight of 1 atom = 6.644×10^-23 g

so, no. of atoms in 80 kg

= 80×10^3 / 6.644×10^-23

= 12.04092‬ × 10²⁶ atoms

As, 1 gram atom = no. atoms in one mole = 6.02×10²³

so, no. of gram atom = 12.04092‬×10²⁶/6.02×10²³
= 2000 gram atoms

Regards