Understanding the Concepts
* Mole (mol): A unit of measurement that represents a specific number of particles (atoms, molecules, ions, etc.). One mole contains 6.022 x 10²³ particles (Avogadro's number).
* Avogadro's Number: The number of particles (atoms, molecules, ions) in one mole of a substance.
Calculation
1. Use Avogadro's Number: Since we know there are 6.022 x 10²³ molecules in one mole, we can set up a conversion factor:
(6.022 x 10²³ molecules) / (1 mol)
2. Multiply by the Number of Moles: To find the number of molecules in 0.357 mol of water, multiply the number of moles by the conversion factor:
0.357 mol * (6.022 x 10²³ molecules / 1 mol) = 2.15 x 10²³ molecules
Answer: There are approximately 2.15 x 10²³ molecules in 0.357 mol of water.
