Final answer:
To find how many molecules of products are formed when reactions complete, we use stoichiometry from the balanced chemical equations. For example, combustion of ethanol produces two molecules of CO₂ and three of H₂O for each ethanol molecule. Applying this to the provided equations enables determination of the respective numbers of CO₂, H₂O, C₂H₅OH, and O₂ molecules produced.
Step-by-step explanation:
To determine how many molecules of each product are present when the chemical reactions go to completion, we need to refer to the balanced chemical equations provided. For example, the combustion of ethanol (C₂H₅OH) with oxygen (O₂) is represented by the equation C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O, which tells us that one molecule of ethanol reacts with three molecules of oxygen to produce two molecules of carbon dioxide (CO₂) and three molecules of water (H₂O).
For the chemical reaction involving the combustion of ethane (C₂H₆), the balanced equation is 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O, which indicates that two molecules of ethane react with seven molecules of oxygen to produce four molecules of carbon dioxide and six molecules of water. If we extend these stoichiometry principles to any given amount of reactants, remembering that these prefactors can represent either the number of individual molecules or moles, we can calculate the total number of product molecules.