Understanding the Concepts
* Mole: A mole is a unit of measurement used in chemistry to represent a specific number of particles (atoms, molecules, ions, etc.). One mole contains 6.022 x 10²³ particles (Avogadro's number).
* Formula Unit: The smallest unit of an ionic compound like potassium chloride. It represents the ratio of ions present in the compound (in this case, one potassium ion (K⁺) and one chloride ion (Cl⁻)).
Calculation
1. Use Avogadro's Number: Since 1 mole of any substance contains 6.022 x 10²³ formula units, we can use this conversion factor to find the number of formula units in 2.45 moles of KCl.
2. Set up a Proportion:
(6.022 x 10²³ formula units / 1 mole) = (x formula units / 2.45 moles)
3. Solve for x:
x = (6.022 x 10²³ formula units/mole) * (2.45 moles)
x ≈ 1.47 x 10²⁴ formula units
Answer: There are approximately 1.47 x 10²⁴ formula units in 2.45 moles of potassium chloride.
