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Calculate the number of moles for the following:
a) 84g of nitrogen atoms
b)8.066 * 1023 number of nitrogen atoms (given atomic mass of n = 14)

Dear Student,

Please find below the solution to the asked query.

1) Atomic mass of nitrogen atom = 14 g
i.e. 14 g  of nitrogen atom = 1 mole of N atoms,
So, 84 g of N atoms = 1 mole14 g×84 g = 6 moles of N atoms

2) 1 mole of N = 6.022 x 1023 atoms,
i.e. 6.022 x 1023 atoms = 1 mole of N
So, 8.066 x 1023 atoms = 1 mole6.022×1023 atoms×8.066×1023 atoms = 1.339 moles of N

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Regards
Akanksha Jain 

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View Full Answer
a) 1 Mole = Atomic mass of nitrogen = 14g 1g = 1/14 Moles 84g=1/14 x 84 =6 moles
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a)  n = m/M
     n = 84/14 = 6 moles.
b) n = N/N naut
    n = 8.022 * 10^23 / 6.022 * 10^23
   n = 

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