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Results tagged with physical-chemistry
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user 16622
The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.
2
votes
How to calculate atomic number of an atom when wavelength is known?
Wikipedia (Bohr Model > Rydberg formula) tells us:
The energy of a photon emitted by a hydrogen atom is given by the difference of two hydrogen energy levels:
$$E=E_i-E_f=R_\mathrm{E} \left( \fr …
3
votes
Calculate the molar fraction of a mixture component given only its pressure
Your mole fraction is $$x_\ce{Ar}=\frac{n_\ce{Ar}}{n_\ce{He}+n_\ce{Ne}+n_\ce{Ar}}$$ and you somehow want to insert your pressures. You can try to convert all moles that you don't know into pressures t …
2
votes
Accepted
Calculating molecular weight of an acid based on titration data
Your error comes from your misunderstanding of what the equivalent points indicate, or as Ivan mystically said:
The reason is in the words "...to reach the first endpoint".
An n-protic acid, h …
12
votes
0
answers
283
views
Calculating Triplet-Triplet Spin-Orbit Coupling
According to the Q-Chem manual [1], the singlet-triplet spin-orbit couplings between a singlet excited state $I$ and a triplet excited state state $J$ is:
$$\langle\Phi_\text{singlet}^I|\hat{\mathrm H …
5
votes
Accepted
Degree of association, van't Hoff factor and dissociation constant
There is absolutely no difference in your two equations but you forgot the units which makes it seem like there is a difference.
Indeed it is in both cases $$k_a=\frac{c~\alpha^2}{1-\alpha}$$
since w …
8
votes
How to explain the discrepancy between the calculated absorption wavelength within the parti...
Luckily I found a source containing your molecule as an example.
You need your equation for the energy difference between the HOMO and the LUMO, which is (nearly) defined as you wrote:
$$\Delta E = \ …
18
votes
1
answer
797
views
Analytical solution of the Schrödinger Equation for AB^+ systems
According to Wikipedia, there are not many problems for which the Schrödinger equation can be solved analytically. [1] The $\ce{H2+}$ ion is probably the most complex molecule that can be treated this …
9
votes
1
answer
762
views
Why is the water solubility of CO worse than that of CO2?
I tried my best to ask SciFinder, Google, and Google Scholar the wrong questions ...
I found many paper on the fitting of the solubility to some equations to be able to calculate the amount of $\ce{CO …
4
votes
The proper explanation for the general formula of the DU?
My answer is based on V. Pellegrin, J. Chem. Educ. 1983, 60 (8), 626 which might be inaccessible for you by a pay wall.
Starting with Eulers characteristic for planar graphs wich states that adding t …