1 mole of any substance corresponds to a special number called "Avogadro's Number" (6.022×10²³ (atoms, molecules, ions) ). The units of this number vary depending upon circumstance. In this problem for example, you are asked about a mole of [tex]H_{2} O[/tex] which is a molecule. Therefore, your units must be molecules rather than atoms or ions.
Answer:
There are 6.022×10²³ molecules of [tex]H_{2} O[/tex] in 1 mole of [tex]H_{2} O[/tex].
