Which of the following is closest to the mass of a single atom of lithium (Li) in grams?

• A. 1.15 × 10^{-23} g
• B. 6.94 g
• C. 1.66 × 10^{-24} g
• D. 3.32 × 10^{-22} g

Answer: (A)

Verified step by step guidance

1. Identify the given information: the atomic mass of lithium (Li) is approximately 6.94 g/mol. This means one mole of lithium atoms has a mass of 6.94 grams.
2. Recall that one mole contains Avogadro's number of atoms, which is approximately \$6.022 \times 10^{23}$ atoms/mol.
3. To find the mass of a single lithium atom, use the formula: \(\text{mass of one atom} = \frac{\text{molar mass}}{\text{Avogadro's number}}\).
4. Substitute the values into the formula: \(\text{mass of one Li atom} = \frac{6.94 \text{ g/mol}}{6.022 \times 10^{23} \text{ atoms/mol}}\).
5. Perform the division to find the mass of a single lithium atom in grams, which will give a value close to one of the provided options.