There are 35.53 × 10²³ formula units in 5.9 mol of NaOH.
Formula units (FUs) is the empirical formula of ionic or covalent compound which is used as an independent entity for the stoichiometric calculations.
Formula units = Moles of given compound × Avogadro number
Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's constant / Avogadro's number.
Avogadro's number = 6.022 × 10²³
Now put the values in above formula we get
Formula units = Moles of given compound × Avogadro number
= 5.9 × 6.022 × 10²³
= 35.52 × 10²³ formula units
Thus, There are 35.53 × 10²³ formula units in 5.9 mol of NaOH.
Learn more about the Avogadro's Number here: brainly.com/question/859564
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