Understanding the Concept

* Avogadro's Number: One mole of any substance contains 6.022 x 10^23 particles (atoms, molecules, or in this case, ions).

Calculation

1. Start with the moles of Na+ ions: 0.187 mol Na+

2. Use Avogadro's Number as a conversion factor:

* 1 mol Na+ = 6.022 x 10^23 Na+ ions

3. Set up the calculation:

0.187 mol Na+ x (6.022 x 10^23 Na+ ions / 1 mol Na+)

4. Calculate:

1.13 x 10^23 Na+ ions

Answer: There are approximately 1.13 x 10^23 Na+ ions in 0.187 mol of Na+ ions.