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Sure! Formula units are just a type of particle associated with ionic compounds so you only use the term formula units when the problem relates to an ionic compound. Other "particles" are atoms and molecules but those are associated with elements and molecular compounds, respectively. Basically, formula units are just a type of particle like atoms or molecules.
Hope this helps!
Hope this helps!
According to the textbook glossary, formula units are the group of ions that matches the formula of the smallest unit of an ionic compound. In terms of an example, the book provides the following: the formula units for sodium chloride, or NaCl, are the one cation of Na+ and the one of anion Cl-. So essentially, I would say that formula units are the anions and cations that make up an ionic compound.
Formula units can be thought of as the same thing as number of molecules. So when given a problem that asks to find the formula units of a compound you just take the number of moles and multiply by Avogadro's number (6.022 x 10^23).
Formula units are different from molecules in that all atoms in an ionic compound have formed atomic bonds with other atoms, to form a lattice. In this way, ionic compounds are not groups of moleculas which are associeated with one another through intermolecular bonds. Rather, they are one coherent compound. Thus, since there is no way to define an individual molecule if all atoms are bonded together, chemists call the ratios of each atom to one another in the ionic compound the formla unit.
Formula units are empirical formulas of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. It is the lowest whole number ratio of ions represented in an ionic compound. There are (Avogadro's number) formula units in 1 mole of ionic compound.
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