Question

Calculate the mass of 6.022 × 10²³ N₂ molecules.

Answer 1

We know, 1 mole = 6.022 × 10²³ 

Now, to calculate mass, apply the formula:

Number of moles(n) = \(\frac{Mass(m)}{Molar\,mass(M)}\)

we can write:

Mass(m) = Number of moles (n) × Molar mass of N₂ (M) 

Mass = 1 mol × 28g/mol Mass = 28g 

Thus, the mass of 6.022 × 10²³ atoms of nitrogen is 28g