Formula units are defined as the empirical formula of an ionic or covalent compound used to express them as independent entities.
Given that:
Given mass = 3.6 gram
Formula units =?
Molecular mass of NaCl = 58.44 g/mol
As we know:
[tex]\rm moles &= \dfrac{\text{given mass}}{molecular\; mass}[/tex]
[tex]\rm moles = \dfrac{3.6}{58.44}\\\\\rm moles = 0.061\\[/tex]
Now,
1 mole = [tex]6.022 \times 10^{23}[/tex]
[tex]\begin{aligned} \rm 0.061\; moles &= 0.061 \times 6.022 \times 10^{23}\\\\\rm moles &=3.67 \times 10^{22}\end[/tex]
Thus, the formula units in the 3.6 grams of NaCl is [tex]3.67 \times 10^{22}[/tex].
To know more about formula units, refer to the following link:
https://brainly.com/question/19293051
