How many moles are present in 3.55 × 10^{22} formula units of NaCl?

• A. 0.590 mol
• B. 0.0060 mol
• C. 0.355 mol
• D. 0.0590 mol

Answer: (D)

Verified step by step guidance

1. Identify the given quantity: 3.55 \times 10^{22} formula units of NaCl.
2. Recall that 1 mole of any substance contains Avogadro's number of formula units, which is approximately 6.022 \times 10^{23} formula units/mol.
3. Set up the conversion to find moles from formula units using the relation: \(\text{moles} = \frac{\text{number of formula units}}{\text{Avogadro's number}}\).
4. Substitute the given values into the equation: \(\text{moles} = \frac{3.55 \times 10^{22}}{6.022 \times 10^{23}}\).
5. Perform the division to calculate the number of moles (do not forget to keep track of significant figures).