C2H4 Bond Energy | Bond Breaking & Adding Energy

[JKLM]

if you have a chemical like C2H4 and you add Br2 to get the change in energy would you have to break every bond and add it up and then subtract something. If you do have to subtract something what would it be. The bond energy of each bond maybe.

 

[Chemicalsuperfreak]

That's one way to do it. You're also breaking a carbon-carbon double bond, a bromine-bromine bond, and making two carbon-bromine bonds. Everything else remains roughly the same.

 

[ravenprp]

Yes, in order to calculate the change in energy for the reaction between C2H4 and Br2, you would need to consider the bond energies of each bond in the reactants and products. This is because in order for a chemical reaction to occur, bonds in the reactants must be broken and new bonds must be formed in the products. The overall change in energy for the reaction is equal to the sum of the bond energies broken (endothermic process) minus the sum of the bond energies formed (exothermic process). This difference in energy is known as the enthalpy change of the reaction.

In this specific case, you would need to break the C-C and H-H bonds in C2H4 and the Br-Br bond in Br2, while forming C-Br bonds in the products. The bond energies of each bond can be found in a bond energy table. However, it is important to note that these values are averages and may vary depending on the specific conditions of the reaction.

In addition to bond energies, there are other factors that may affect the overall energy change of the reaction, such as changes in temperature and pressure. These factors would also need to be considered when calculating the enthalpy change of the reaction.

In summary, to accurately determine the change in energy for a reaction like C2H4 + Br2, it is necessary to consider the bond energies of each bond involved in the reaction and subtract the energy released from the energy absorbed.