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### Use bond enthalpies in Table 5.4 to estimate $\De… 03:32 Manhattan College Need more help? Fill out this quick form to get professional live tutoring. Get live tutoring Problem 82 Without doing any calculations, predict the sign of$\Delta H\$ for each of the following reactions:
$$\begin{array}{l}{\text { (a) } 2 \mathrm{NO}_{2}(g) \longrightarrow \mathrm{N}_{2} \mathrm{O}_{4}(g)} \\ {\text { (b) } 2 \mathrm{F}(g) \longrightarrow \mathrm{F}_{2}(g)} \\ {\text { (c) } \mathrm{Mg}^{2+}(g)+2 \mathrm{Cl}^{-}(g) \longrightarrow \mathrm{MgCl}_{2}(s)} \\ {\text { (d) } \mathrm{HBr}(g) \longrightarrow \mathrm{H}(g)+\mathrm{Br}(g)}\end{array}$$

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## Video Transcript

Hey, Hey, guys, we're doing Chapter five Problem eighty two. And here we're going, Tio, because understand how we can guess if a specific chemical reaction is except Eric. Or if it's endo thermic. So as a general rule, you are no as if you're forming a bond at academic. If you're breaking a bond at Endo thermic. So here we're converting to know too toe end to a four for forming bonds. And this is so this is an ex atomic reaction, so Delta age is less than zero. So here we're converting tio two flooring in Adam's into florin molecules that forming a bond that is except thermic. Here we had reforming a bond between a magnesite mine and chloride ion ion, and as a general rule, is drool. It's also important. Remember where that went. Ions coming together for are attractive interactions that that is always an exit, an exit permit process that there was a favorable process, and lastly, we're converting yards, age plus and B R minus. This is and endo thermic process. Because we are breaking a pond, we have to input energy into our system to break that bond. So remember they're forming bonds. Exeter, Mick breaking bond is endo thermic. Thank you