Here's how to count the atoms in the chemical equation CH4 + 2O2:

* CH4 (Methane):

* 1 Carbon atom (C)

* 4 Hydrogen atoms (H)

* 2O2 (Oxygen):

* 2 x 2 = 4 Oxygen atoms (O)

Total:

* Carbon: 1

* Hydrogen: 4

* Oxygen: 4

Therefore, there are a total of 9 atoms in the equation CH4 + 2O2.