A silver necklace has a mass of 21.6 g. How many moles of silver atoms are present in the necklace? (Atomic mass of Ag = 107.87 g/mol)

• A. 0.200 mol
• B. 1.00 mol
• C. 0.500 mol
• D. 2.00 mol

Answer: (A)

Verified step by step guidance

1. Identify the given information: the mass of the silver necklace is 21.6 g, and the atomic mass of silver (Ag) is 107.87 g/mol.
2. Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}}\).
3. Substitute the known values into the formula: \(\text{moles of Ag} = \frac{21.6\ \text{g}}{107.87\ \text{g/mol}}\).
4. Perform the division to find the number of moles of silver atoms in the necklace.
5. Compare your calculated value with the given answer choices to select the correct number of moles.