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Question

The number of atoms present in 4.25 grams of NH3 is approximately 


  1. 1 X 1023

  2. 1.5 X 1023

  3. 2 X 1023 NH3

  4. 6.02 X 1023


Solution

The correct option is D

6.02 X 1023


Number of atoms in a NH3 molecule is 4.

Atomic weight of Nitrogen is 14.

Atomic weight of hydrogen is 1.

Molecular weight of NH3 is

14+3(1)=17

So, no of atoms in the molecule is

4.2517 × 4 × 6.023 × 1023 = 6.023 × 1023

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