Chapter SH, Problem 18.4APP

To determine

To calculate: The number of hydrogen atoms in three molecules of ammonium sulfate, ${{\text{(NH}}_4)}_2{\text{SO}}_4$ .

Answer to Problem 18.4APP

There are $24$ hydrogen atoms in three molecules of ${{\text{(NH}}_4)}_2{\text{SO}}_4$ .

Explanation of Solution

Given data:

The compound formula: ${{\text{(NH}}_4)}_2{\text{SO}}_4$ .

As per the problem,

One molecule of ${{\text{(NH}}_4)}_2{\text{SO}}_4$ is formed by two ions of ${\text{NH}}_4^{+}$ and one ion of ${\text{SO}}_4^{2-}$ .

One ion of ${\text{NH}}_4^{+}$ is formed of four hydrogen atoms.

Therefore, two ions of ${\text{NH}}_4^{+}$ contains eight hydrogen atoms.

So, one molecule of ${{\text{(NH}}_4)}_2{\text{SO}}_4$ contains $8$ atoms of hydrogen

So, three molecules of ${{\text{(NH}}_4)}_2{\text{SO}}_4$ will contain $8\times 3=24$ atoms of hydrogen.

Conclusion:

There are $24$ hydrogen atoms in three molecules of ${{\text{(NH}}_4)}_2{\text{SO}}_4$ .