What Is 6CO2+6H20?

Basically this is the equation of photosynthesis and the complete equation is as follows:

6CO₂ + 6H₂O + Energy -----> C₆H₁₂O₆ + 6O₂

The reactants in this equation are carbon dioxide, water and energy and the products or the reaction include glucose and oxygen. In a photosynthesis reaction, plants trap the carbon dioxide from the air and roots absorb water from the soil. Then plants take energy from the sun and these three inputs or the reactants react to form glucose and oxygen. Oxygen is considered as a by-product of the reaction.

Photosynthesis equation

Simply 6 molecules of carbondioxide + 6 molecules of water.  01 molecule of water can be written as simply H2o which means 2 atoms of hydrogen & one atom of oxygen e.g   H-O-H .i.e water exist as molecule not as an atom.    Same is the case of CO2.