The Total solution for NCERT class 6-12
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) 1 mole of Ar = 6.022 × 1023 atoms of Ar
52 mol of Ar = 52 × 6.022 × 1023 atomsof Ar
= 3.131 × 1025 atoms of Ar
(ii) 1 atom of He = 4 u of He
Or,
4 u of He = 1 atom of He
= 13 atoms of He
(iii) 4 g of He = 6.022 × 1023 atoms of He
.52 g of He atoms of He