Bond enthalpies

[Carlos Gonzales 1H]

In a test if we are asked to solve for the enthalpy of a reaction will we be given a chart with the enthalpies for the different bonds?

[Yiwei Zhou 2I]

I think we would be given certain bond enthalpies value instead of a whole chart

[AnuPanneerselvam1H]

We will be given bond enthalpies and we will have to determine reaction enthalpy depending on which bonds are broken and which bonds are formed.

[Nate O 2L]

Are these enthalpies Okay to use because I think Dr. Lavelle said that they were the most innacurate

[Priyanka Bhakta 1L]

If the bond enthalpies are given and/or the question asks for us to calculate the reaction enthalpy by using the given table/values, I would use them and solve the problem that way. I think Dr. Lavelle told us that bond enthalpies are the least accurate way just as a note and maybe for conceptual questions, but we should just use whatever is given to us to solve the problems.

Another key thing to remember is that to find the reaction enthalpy by bond enthalpies, deltaHrxn = sum(enthalpies bonds broken) - sum(enthalpies bonds formed).