Dissociation Energy

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Germar G 4F
Posts: 38
Joined: Fri Sep 28, 2018 12:28 am

Dissociation Energy

Postby Germar G 4F » Sat Nov 10, 2018 5:15 pm

Why is the dissociation energy of a covalent bond, like N2, 932 kJ/mol and an ionic bond's, like NaCl, is -250 kJ/mol? (I wrote these down on my notes from the lecture). Since ionic bonds are stronger, wouldn't it have a much higher dissociation energy than N2? Why is it's dissociation energy negative?

Casandra
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: Dissociation Energy

Postby Casandra » Sat Nov 10, 2018 5:37 pm

Germar G 4F wrote:Why is the dissociation energy of a covalent bond, like N2, 932 kJ/mol and an ionic bond's, like NaCl, is -250 kJ/mol? (I wrote these down on my notes from the lecture). Since ionic bonds are stronger, wouldn't it have a much higher dissociation energy than N2? Why is it's dissociation energy negative?


Dissociation energy is negative because it is indicating that there is energy being released when the bond of NaCl, for example, is forming. Whereas the dissociation energy would be positive if energy was being taken in. In the lecture notes, the bond between NaCl is stronger and more stable than that of N2, the positive and negative values of the dissociation energy just indicate whether energy was released or absorbed.

Shibhon_Shepard
Posts: 62
Joined: Wed Nov 15, 2017 3:04 am

Re: Dissociation Energy

Postby Shibhon_Shepard » Sat Nov 10, 2018 6:38 pm

Okay, if the negative is releasing or absorbing energy what does the positive indicate?

Elizabeth Kim 4E
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Dissociation Energy

Postby Elizabeth Kim 4E » Sat Nov 10, 2018 7:00 pm

Dissociation energy is negative when the bond is releasing energy, and it is positive when it is absorbing energy


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