One atom of an element X’ weighs `6.644 xx 10^(-23)` g. Calculate the number of gram atoms in 80 kg of it.

Explanation

Wt. of 1 mole of atoms of X = wt. of 1 atom x Av. const.
`=6.44 xx 10^(-23) xx 6.022 xx 10^(23)`
= 40 g
Thus, the at. Wt. Of X=40
No. Of moles (or gram-atoms) of X `=("weight in g")/("at. Wt")`
`=(40 xx 1000)/40 = 1000`