Question

the number of moles of nitrogen in 56g nitrogen gas

Answer 1

Answer: 1.20400 × 10^24 

Answer 2

AS THE MOLAR MASS OF N2 = 28 g/mol
HERE GIVEN MASS  = 56 g
NO. OF MOLES = GIVEN MASS / MOLAR MASS 
= 56 /28 = 2 mol

HENCE , YOUR ANSWER IS 2 moles