New answers tagged stability
2
The thermodynamic data refers to formation of the given compounds from the elements in their standard states. For instance for $ \ce{ ZnO(s)}$ it refers to the reaction
$ \ce{ Zn(s) +1/2O2(g) ->ZnO(s)} \tag{1}$
with each element or compound present at a pressure of 1 bar and (unless noted otherwise) a temperature of 298.15 K.
A more negative value of $\...
1
The modern definition of thermodynamic stability is the state of maximum entropy.
Some background information is necessary to make sense of this. I hope you will find the following helpful!
Phenomenologically, thermodynamic stability is the absence of visible change. This is the 'original' definition, employed by experimentalists during the 18th and 19th ...
7
The full phrase should be thermodynamic stability with respect to ____, where the dash indicates a process, or a chemical reaction.
A mixture of hydrogen and oxygen is thermodynamically unstable with respect to water formation.
Similarly, a diamond is not forever (which may not please De Beers and ladies). It is thermodynamically unstable with respect to ...
7
You have to consider the system as a whole - you can't directly compare $\ce{O_2}$ and $\ce{O_2^2+}$ because they have different numbers of particles. To put it another way when you consider the relative stability of two interconvertible specifies you really have to write down a chemical reaction that connects them, and then consider which direction is ...
3
I am not sure the 3D conformation stills as reported on PubChem are all that accurate. Although crystal structures are sometimes referenced for specific molecules, some of the displays are in fact models, some of which do not make sense to me.
Here are some observations regarding the three molecules you noted.
2-Nitrobenzoic acid
The PubChem model shows both ...
0
To know which resonance form contributes more you can follow the following priority
1)Contributing structures in which octet rule is exceeded for second row elements make no contribution.
2)As long as the octet rule it is not exceeded for second row elements the contributing structure with greater number of covalent bonds contributes more to the resonance ...
Top 50 recent answers are included
