The mass of nitrogen to the mass of hydrogen in ammonia is always _____ in ratio.

The chemical formula of ammonia= NH₃

Mass of 1 hydrogen atom= 1 u

Mass of 3 hydrogen atoms= $3\times 1 \mathrm{u}= 3 \mathrm{u}$

Mass of 1 Nitrogen atom= 14 u

The mass ratio of nitrogen to hydrogen in ammonia is = $\frac{14}{3}$

Hence, Whatever the source of ammonia, the mass ofnitrogen to the mass of hydrogen in ammonia is always 14:3.