Given:
Number of moles = 0.5
Atomic mass of N = 14 u
Molar mass of N = 14g/mol
To calculate the mass, apply the formula:
Number of moles (n) = \(\frac{Molar\,(m)}{Molar\,mass\,(M)}\)
we can write:
Mass(m) = Number of moles (n) × Molar mass (M)
Mass = 0.5 mol × 14g/mol
Mass = 7g
Thus, the mass of 0.5 mole of N atoms is 7g.