Answer:
CH4 =Methane (one atom of carbon and four atoms of hydrogen). It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
202= Oxygen.
CO2= Carbon dioxide (one Carbon atom and two oxygen atom)
2H20= 2H2O means two molecules of water(H2O)
CH and CO2= the main difference between CO2 and CO2e is that CO2 only accounts for carbon dioxide, while CO2e accounts for carbon dioxide
CO= Carbon monoxide (CO), a colorless, odorless, and tasteless gas. Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O.
H2O = water ( one hydrogen atom and two oxygen atoms)