Question

Calculate the number of atoms in 10 litres of ammonia (N=14,H=1).

Answer 1

22.4L NH3 has 1 mole
∴1L has $\frac{1}{22.4}$
∴10L has $\frac{1}{22.4}$×10 moles

Now multiply the no. Of moles with avogadro number.