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1 mole of Nitrogen atom --------------  14 g. right!!!
Let the mass,
as x, then, 
x = 14 /2
=7 g.

Thank you.
Hope this will help you.
Mass of one mole of n atom = 14g
mass of 0.5 mole of n atom=14 x 0.5= 7g

0.5 mole of n atom= 7g
 hope this helps u