NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

Question : 33

Total: 36

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.

Solution:

(i) 1 mole of Ar contains 6.022 × 1023 atoms
52 moles of Ar contains 52 × 6.022 × 1023 = 3.13 × 1025 atoms
(ii) 4 u of He = 1 atom
52 u of He =

× 52 = 13 atoms
(iii) 4 g of He contains 6.022 × 1023 atoms
52 g of He contains

6.022×1023

× 52 = 7.83 × 1024 atoms

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