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Q.

Calculate the mass of 3.011 x 10 23 number of nitrogen (N) atoms.

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a

5g

b

8g

c

14g

d

7g

answer is D.

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Detailed Solution

Given: Number of particles (N) = 3.011 x 1023 

               Avogadro's number (N0) = 6.022 x 1023 

Solution:  No of moles = Number of particles givenAvogadro's number  

                                              = 3.011 x 1023 6.022 x 10 23

                                              = ½

    Molar mass of nitrogen atom = 14g 

    Mass of a substance = Molar mass of a substance × Number of moles of a substance

                                               = 14 x ½

                                             = 7g

The mass of 3.011 x 1023 number of nitrogen (N) atoms is 7g.                                                           

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