* Atoms per molecule: Each carbon dioxide (CO2) molecule has 1 carbon atom and 2 oxygen atoms, for a total of 3 atoms per molecule.

* Atoms in two molecules: Since you have two molecules of CO2 (2CO2), you have 2 x 3 = 6 atoms in total.

* Atomic composition: These atoms are made up of:

* Carbon (C): 2 carbon atoms

* Oxygen (O): 4 oxygen atoms

Therefore, in two molecules of carbon dioxide (2CO2), there are 6 atoms, made up of 2 carbon atoms and 4 oxygen atoms.