Understanding the Concept

* Mole (mol): A mole is a unit of measurement that represents a specific number of particles (atoms, molecules, ions, etc.). One mole is equal to 6.022 x 10²³ particles, which is known as Avogadro's number.

Calculation

1. Avogadro's Number: We'll use Avogadro's number (6.022 x 10²³) as the conversion factor between moles and molecules.

2. Set up the conversion:

* (2.43 mol H₂O) x (6.022 x 10²³ molecules H₂O / 1 mol H₂O)

3. Cancel out the units: Notice how the "mol H₂O" units cancel out, leaving us with "molecules H₂O".

4. Calculate:

* 2.43 x 6.022 x 10²³ = 1.46 x 10²⁴ molecules H₂O

Answer: There are approximately 1.46 x 10²⁴ molecules of H₂O in 2.43 mol of H₂O.