Question

6x10^22 atoms of element weigh 13.8 gm the atomic mass of the lement is

Answer 1

No of atoms = mass ÷ molecular mass × avagadro number
6 × 10^22 = 13.8 ÷ molecular mass × 6.02 × 10^23

Molecular mass = 13.8 × 6.02× 10^23 ÷ 6. ×10^22
Molecular mass = 138.46




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