Understanding the Concepts
* Mole (mol): A unit of measurement for the amount of a substance. One mole contains 6.022 x 10²³ particles (atoms, molecules, etc.). This is known as Avogadro's number.
* Avogadro's Number: The fundamental constant relating the number of particles in a mole.
Calculation
1. Use Avogadro's Number: Since one mole of any substance contains 6.022 x 10²³ particles, we can use this relationship to find the number of molecules in 0.900 mol of O₂.
2. Multiply by the number of moles:
(0.900 mol O₂) * (6.022 x 10²³ molecules O₂ / 1 mol O₂) = 5.42 x 10²³ molecules O₂
Answer: There are 5.42 x 10²³ molecules of O₂ in 0.900 mol of O₂.
