Question

Calculate the number of atoms in each of the following:
i) 0.08 g of hydrogen
ii) 0.008 g of sulphur

Answer 1

(i) 1 mol of H = 6.022×1023atoms
0.08 g of hydrogen= 0.08x 6.022×1023atoms
= 4.1876x 1024atoms


ii) 1 mole of Sulphur (S8)  = 8 × 32 g = 256 g
256 g of sulphur contains =6.022 × 1023  molecules of sulphur
0.008 g of Sulphur = 0.008x 6.022×1023/256 atoms

0.008 g of Sulphur = 0.0018x 1024atoms