Combining Methods
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 34
- Joined: Mon Jan 09, 2023 8:58 am
Combining Methods
If givenb both the bond enthalpies and the standard enthalpy of formation, how would you to find the total enthalpy of reaction by using both of these values?
-
- Posts: 35
- Joined: Mon Jan 09, 2023 10:04 am
Re: Combining Methods
If you have the standard enthalpy of formation of either reactants or products and relevant bond energies, you would first plug in all the information you have into the formula of delHreactants - delHproducts = delHreaction. Then, you can use bond energies once you determine which bonds are formed and broken by adding the energies of bonds that are broken (since they require energy and are endothermic), while subtracting bond energies for bonds that are formed (since they release energy and are exothermic) to the standard enthalpies of the reactants or products that you already know.
-
- Posts: 33
- Joined: Mon Jan 09, 2023 9:01 am
Re: Combining Methods
Hi Derreck. If you are given both the bond enthalpies and enthalpies of formation for both the reactants and products, you can use either method to solve for the final change in energy. However, it's not recommended to combine methods. If you were, for example, to try to use bond enthalpies for reactants and enthalpy of formation for products, you could hypothetically calculate enthalpy of formation for the reactants using bond enthalpies and then use that with the enthalpy of formation for the proudcts. In any situation where you have to try to combine methods, it would be safer and more straightforward to stick to one method. Hope this helped!
Who is online
Users browsing this forum: No registered users and 16 guests