Final answer:
To convert 4.38 x 10^23 formula units of sodium chloride to moles, you can use Avogadro's number. The answer is 0.727 moles.
Step-by-step explanation:
To convert 4.38 x 1023 formula units of sodium chloride to moles, we can use the Avogadro's number to find the number of moles.
Avogadro's number is 6.022 x 1023 formula units per mole.
So, we can set up a proportion:
4.38 x 1023 formula units / X moles = 6.022 x 1023 formula units / 1 mole
Solving for X, we find that
X = 4.38 x 1023 / 6.022 x 1023
= 0.727 moles.