Question

What is the ratio by mass of nitrogen and hydrogen in ammonia?

Answer 1

Ammonia has a molecular formula that is ${\mathrm{NH}}_3$

${\mathrm{NH}}_3$ is composed of:-

1. 3 H-atom
2. 1 N-atom

Mass of H-atoms in ammonia = (3×1)u

Mass of N-atom in ammonia = 14u

$$\begin{gathered} \mathrm{Ratio}\mathrm{of}\mathrm{mass}=\frac{\mathrm{Mass}\mathrm{of}\mathrm{nitrogen}\mathrm{atom}}{\mathrm{Mass}\mathrm{of}\mathrm{hydrogen}\mathrm{atoms}} \\ \mathrm{Ratio}\mathrm{of}\mathrm{mass}=\frac{14}{3} \end{gathered}$$

Hence, the ratio by mass of nitrogen and hydrogen in ammonia is 14:3.