Understanding the Concept
* Avogadro's Number: One mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, etc.). This is known as Avogadro's number.
Calculation
1. Set up the conversion:
(2.51 moles Kr) x (6.022 x 10²³ atoms Kr / 1 mole Kr)
2. Cancel out the units:
The "moles Kr" units cancel out, leaving you with atoms of Kr.
3. Calculate the result:
(2.51) x (6.022 x 10²³) = 1.51 x 10²⁴ atoms Kr
Therefore, there are 1.51 x 10²⁴ Kr atoms in 2.51 moles of Kr.
