Any units will do. for example, let's use the unit of "dozens":

2 dozen of h2 particles + _(1, 2, or dozen of o2 particles → _(1, 2, or 3)_ dozen water particles

2 dozen of H₂ particles  + 1 dozen of O₂ particles  → 2 dozen of H₂O particles.

Explanation:

2H₂ + O₂ → 2H₂O.

So, every 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.

So, the represented reaction of the problem is:

2 dozen of H₂ particles  + 1 dozen of O₂ particles  → 2 dozen of H₂O particles.

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.

2b2t

explanation:

2b2t