How Many Molecules of CO2, H2O, C2H5OH, AND O2 Will Be Present If the Reaction Goes to Completion?

Answer:- If the reaction goes to completion, there will be 1 molecule of CO2, 3 molecules of H2O, and 1 molecule of C2H5OH for every 1 molecule of O2 that reacted. This is because the balanced equation for the combustion of ethanol is:

C2H5OH + 3O2 -> 2CO2 + 3H2O

As you can see, the coefficients in front of each molecule on the product side are multiples of the coefficients in front of the corresponding molecules on the reactant side. This means that for every 1 molecule of C2H5OH that reacts, 3 molecules of O2 will react, and 2 molecules of CO2 and 3 molecules of H2O will be produced.

For example, if we start with 10 molecules of O2, then 10/3 = 3.33 moles of C2H5OH will react, and 2 * 10 = 20 molecules of CO2 and 3 * 10 = 30 molecules of H2O will be produced.

It is important to note that these are just theoretical values. In reality, the reaction will not go to completion, and there will be some amount of reactants and products that remain. The actual number of molecules of each species present will depend on the reaction conditions, such as the temperature, pressure, and concentration of the reactants.