* Avogadro's Number: A mole of any substance contains Avogadro's number of particles (approximately 6.022 x 10^23).
* Molecules vs. Atoms: Uranium (U) is an element, meaning it exists as individual atoms. CO2 is a molecule, composed of one carbon atom and two oxygen atoms.
Therefore:
* One mole of uranium contains 6.022 x 10^23 uranium atoms.
* One mole of CO2 contains 6.022 x 10^23 CO2 molecules, but since each CO2 molecule has 3 atoms, it contains 3 times that number of atoms (1.8066 x 10^24 atoms).
In summary: While both have the same number of *units* (moles), they have different numbers of *individual particles* because CO2 molecules are made of multiple atoms.
