CHEMISTRY COMMUNITY

Use the data in Tables 4E.2 and 4E.3 to estimate the reaction enthalpy for
b) CH3CHCH2(g) + H2O(g) --> CH3CH(OH)CH3(g)
I am really confused on how to determine which bonds are broken/formed. I looked at all the bonds but the solution only used a few. how do we know which ones to use?

It's easier to tell if you draw the lewis structure of the entire reaction. In this case, one O-H is broken, and one C-O and one C-H bond is created.

Amy Luu 2G wrote:Use the data in Tables 4E.2 and 4E.3 to estimate the reaction enthalpy for
b) CH3CHCH2(g) + H2O(g) --> CH3CH(OH)CH3(g)
I am really confused on how to determine which bonds are broken/formed. I looked at all the bonds but the solution only used a few. how do we know which ones to use?

I also have a question on part a of this question. I'm not sure how exactly to determine the signs of the bond enthalpy values, so I keep getting the wrong answer. I know that the bonds of N₂ and F₂ have to be broken in order to form the NF bonds, but I'm lost from this point.