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Home » 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
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
CBSE | Chemistry | Class 11 | NCERT | Some Basic Concepts of Chemistry
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) 52 moles of Ar

1 mole of Ar = 6.023 \; \times \; 10^{ 23 }atoms of Ar

Therefore, 52 mol of Ar = 52 × 6.023 \; \times \; 10^{ 23 }atoms of Ar

= 3.131 \; \times \; 10^{ 25 } atoms of Ar

 

(ii) 52 u of He

1 atom of He = 4 u of He

OR

4 u of He = 1 atom of He

1 u of He = \frac{ 1 }{ 4 } atom of He

52 u of He = \frac{ 52 }{ 4 }atom of He

= 13 atoms of He

 

(iii) 52 g of He

4 g of He = 6.023 \; \times \; 10^{ 23 } atoms of He

52 g of He = \frac{ 6.023 \; \times \; 10^{ 23 } \; \times \;52 }{ 4 }atoms of He

= 7.8286 \; \times \; 10^{ 24 } atoms of He

 

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