Calculate the number of atoms in each of the following (i) 52 moles of ar (ii) 52 u of he (iii) 52 g of he.

(i) The number of atoms present in 52 mol of Ar are 52 x 6.022 x 10^23

(ii) 52 u of He will contain 52/4 = 13atoms

(iii) 52g of He will contain 52/4 x 6.022 x 10^23 = 7.82 x 10^24 atoms