How many moles of atoms are present in 4.00 g of 13C?

• A. 0.308 mol
• B. 0.500 mol
• C. 0.154 mol
• D. 0.333 mol

Answer: (A)

Verified step by step guidance

1. Identify the isotope and its atomic mass. Here, the isotope is carbon-13 (\(^{13}C\)), which has an atomic mass of approximately 13.00 g/mol.
2. Write down the given mass of the sample: 4.00 g of \(^{13}C\).
3. Use the formula to calculate moles from mass: \[ \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \]
4. Substitute the values into the formula: \[ \text{moles} = \frac{4.00 \text{ g}}{13.00 \text{ g/mol}} \]
5. Perform the division to find the number of moles of \(^{13}C\) atoms in the sample.