Given the same reaction as before:

4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2

Great! 3.21 moles of O2 were produced.
Now, How many molecules of O2 does this number of moles represent?

molecues=moles*avagrado number

To determine the number of molecules of O2, you need to use Avogadro's number, which specifies the number of particles (atoms, molecules, or formula units) in one mole of a substance. Avogadro's number is approximately 6.02 x 10^23.

Here's how you can calculate the number of molecules of O2:

1 mole of any substance contains Avogadro's number of particles. In this case, 1 mole of O2 contains the same number of molecules as Avogadro's number.

So, to find the number of molecules in 3.21 moles of O2, multiply the number of moles by Avogadro's number:

Number of molecules = 3.21 moles x (6.02 x 10^23 molecules/mole)

Calculating the above expression will give you the number of molecules of O2.