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Q.

The number of molecules present in 14g of N2molecule is


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a

6.022×1023 

b

1.51×1023 

c

6.030×1023  

d

3.011×1023 

answer is B.

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Detailed Solution

detailed_solution_thumbnail
3.011×1023 is the number of molecules present in 14g of N2 molecule.
The number of moles of N2 molecule can be calculated by
Moles = given mass/ molar mass
So the number of moles of N2 molecule with a molar mass of 28g will be
1428
  0.5
Since 1 mole of nitrogen molecule contains 6.023×1023  molecules(Avagadro number)
So the number of nitrogen molecules in 0.5 mole of nitrogen would be
 0.5×6.023×1023 3.011×1023 
 
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