Here's how to calculate the number of atoms in 0.308 moles of ¹³C:

1. Avogadro's Number

* Avogadro's number states that there are 6.022 x 10²³ atoms (or molecules) in one mole of any substance.

2. Calculation

* Multiply the number of moles by Avogadro's number:

0.308 moles ¹³C * (6.022 x 10²³ atoms/mole) = 1.85 x 10²³ atoms of ¹³C

Therefore, there are approximately 1.85 x 10²³ atoms of ¹³C in 0.308 moles.