Question

calculate the mass of 3.011*10^23 number of Nitrogen atoms.

Answer 1

no of moles = 0.5

atomic mass × moles = mass
14×0.5=7=mass

Answer 2

No of atoms = 3.011 x 10^23 

Atomic Mass of Nitrogen = 14 g 

1 mole of nitrogen contains 6.022 x 10^23 atoms 

14g of nitrogen contains 6.022  x 10^23 atoms 

14/6.022 x 10^23 g contains 1 atom 

(14/6.022 x 10^23 ) x 3.011 x 10^23 g contains 14/2 = 7 g of N