The atomic mass of Na is 22.99 g/mol, and the atomic mass of Cl is 35.45 g/mol. Therefore, the molar mass of NaCl is:
$$22.99 \text{ g/mol} + 35.45 \text{ g/mol} = 58.44 \text{ g/mol}$$
Now, we can calculate the number of moles in 4.816 x 10^24 formula units of NaCl using the following formula:
$$\text{Moles} = \frac{\text{Mass in grams}}{\text{Molar mass}}$$
Substituting the given values into the formula, we get:
$$\text{Moles} = \frac{4.816 \times 10^{24} \text{ formula units} \times 58.44 \text{ g/mol}}{6.022 \times 10^{23} \text{ formula units/mol}}$$
$$\text{Moles} = 4.01 \text{ mol}$$
Therefore, there are 4.01 moles in 4.816 x 10^24 formula units of NaCl.
