Here's how to calculate the number of moles of carbon-13 atoms in 8 grams:

1. Molar Mass of Carbon-13

* Carbon-13 has a molar mass of approximately 13 g/mol (since its atomic mass is 13).

2. Moles Calculation

* Moles = Mass (g) / Molar Mass (g/mol)

* Moles = 8 g / 13 g/mol

* Moles ≈ 0.615 moles

Therefore, there are approximately 0.615 moles of carbon-13 atoms in 8 grams.