Understanding the Concept
* Avogadro's Number: One mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, ions, etc.). This number is called Avogadro's number.
Calculation
1. Set up the conversion:
* 25.9 mol Fe x (6.022 x 10²³ atoms Fe / 1 mol Fe)
2. Cancel out units:
* The "mol Fe" units cancel out, leaving you with just "atoms Fe".
3. Calculate:
* 25.9 x 6.022 x 10²³ = 1.56 x 10²⁵ atoms Fe
Answer: There are approximately 1.56 x 10²⁵ atoms of iron in 25.9 moles of iron.
