Determine the quantity of moles in 1.81 x 10^24 atoms of Na

Explanation:

To determine the quantity of moles in 1.81 x 10^24 atoms of Na, we need to use Avogadro's number which states that 1 mole of any substance contains 6.022 x 10^23 particles.

Given that there are 1.81 x 10^24 atoms of Na, we can set up a proportion using the ratio:

1 mole / 6.022 x 10^23 atoms = x moles / 1.81 x 10^24 atoms

By cross multiplying and solving for x, the quantity of moles in 1.81 x 10^24 atoms of Na is approximately 3 moles.