Bookwork 4E #7b

[Meagan Kimbrell 1I]

Estimate the reaction enthalpy for:
CH3CHCH2 (g) + H2O (g) → CH3CH(OH)CH3 (g)

I attempted this problem, but my bonds broken and formed do not match what the answer key says. I attached my work, including structures to illustrate the bonds of this reaction. If anyone can help show me what I did wrong, it would be greatly appreciated!

To clarify, I thought that 1 C=C bond and 1 O-H bond would be broken while 3 C-H bonds and 1 C-O bond would be formed. The answer key confirms my bonds broken, but has 1 C-C bond, 1 C-O bond, and 1 C-H bond formed instead.

[Stephen_Kim_1D]

Your problem says CH3CHCH2, but on your attached work you put CH3CHC2 instead. I think the former is correct so on your first molecule that single-bonded carbon at the bottom right shouldn't be there and the double-bonded carbon should have two hydrogens attached to it.