How many formula units of NaNO3 are in 2.99 moles of NaNO3 (Mw. 85.00 g/mol)? The term "formula unit" is used when carrying out calculations involving ionic compounds. Just understand that whilst we would refer to it as being a molecule had it been covalent, we call the compound a formula unit here when it involves ionic bonding.

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Quantum Mechanical Treatment of the Valence Bond Theory

Quantum mechanical treatment of valence bond theory refers to the relationship established between the quantum mechanical theory and the valence bond theory to describe the chemical bonding in a particular molecule.