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:

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 Natoms is 7g.