Which have same number of Atoms

Last updated at Dec. 16, 2024 by

Which of the following pairs have the same number of atoms?

A - 16 g of O 2 (g) and 4 g of H 2 (g)

B - 16 g of O 2 and 44 g of H 2

C - 28 g of N 2 and 32 g of O 2

D - 12 g of C(s) and 23 g of Na(s)

 

Answer

C - 28 g of N 2 and 32 g of O 2

D - 12 g of C(s) and 23 g of Na(s)

 

Explanation:

One mole of any species (atoms,molecules, ions or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams.

1 mole of an item = 6.022 x 10 23 items

 

In 28 g of N 2 and 32 g of O 2

  • 28 g of N 2 = 1 mole of N 2 = 2 x 6.022 x 10 23 atoms
  • 32 g of O 2 = 1 mole of O 2 = 2 x 6.022 x 10 23 atoms

 

In 12 g of C(s) and 23 g of Na(s)

  • 12 g of C(s) = 1 mole of C = 6.022 x 10 23 atoms

23 g of Na(s) = 1 mole of C = 6.022 x 10 23 atoms

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo