Question

Determine the formula unit mass of the following substance.

Ammonium nitrate $$\left(\mathrm{NH}_4\mathrm{NO}_3\right)$$, used as a nitrogen fertiliser, which is essential for plant growth.

Answer 1

$$\mathrm{NH}_4\mathrm{NO}_3 = 2(14)+4(1)+3(16)=80\ \mathrm{u}$$