How many moles of silver atoms are present in 1.8 × 10^{20} atoms of silver?

• A. 6.0 × 10^{-2} mol
• B. 1.8 × 10^{-2} mol
• C. 3.0 × 10^{-4} mol
• D. 1.1 × 10^{-3} mol

Answer: (C)

Verified step by step guidance

1. Identify the given quantity: the number of silver atoms is \$1.8 \times 10^{20}$ atoms.
2. Recall Avogadro's number, which is the number of atoms in one mole: \$6.022 \times 10^{23}$ atoms/mol.
3. Set up the conversion from atoms to moles using the relationship: \(\text{moles} = \frac{\text{number of atoms}}{\text{Avogadro's number}}\).
4. Substitute the given values into the formula: \(\text{moles} = \frac{1.8 \times 10^{20}}{6.022 \times 10^{23}}\).
5. Perform the division to find the number of moles of silver atoms (do not calculate the final value here, just set up the expression).