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What happens when you run house electricity (120VAC) through salt water? (with standard copper wires!)
Well, in https://youtu.be/dcrY59nGxBg , an interesting experiment was conducted to find out!
At the end of the video, however, I noticed the salt water became rather dark and murky, and I'm wondering what happen... |
VO2 is a weird metal which becomes a conductor at temperatures higher than 67 degress celcius but below 67 degrees celcius it is an insulator!
How is this possible anyway?This is against solid state theory and how are we supposed to create band gaps with it? |
I've got the following question in a workbook which I need to solve:
> A $\pu{50 g}$ sample of an experimental catalyst used in the polymerisation of butadiene is made up of $\pu{11.65 g}$ of $\ce{Co}$ and $\pu{25.7 g}$ of $\ce{Cl}$. If the molar mass of the compound is $\pu{759 g/mol},$ find the molecular formula o... |
One of my lecturers last year (a pharmacologist by training) used the symbol $\Omega ^m$ as a shorthand for equilibrium. He implied it was common practice but I've never come across it elsewhere. I was wondering if anyone else has encountered it? |
Has anyone encountered the use of Omega to represent equilibrium? |
Let's assume there is no air movement in the refrigerator. Is this enough for sinking of nitrogen? If not in what (low) temperatures we will start to see evident distinction between the composition of air in the upper and lower parts? |
Will heavy gases sink in a closed refrigerator? |
Perturbational Molecular Orbital Theory - How to derive the results? |
**No, that's not enough**, otherwise there would be industrial processes based on it. You won't have any significant separation before the main components of air start to liquefy.
Meet the [barometric formula][1]:
$$\mathfrak p=\mathfrak p_0\cdot exp\left(-{Mgh\over RT}\right)$$
Plug the height of $1\;\rm m$ ... |
I want to ask a question about determining the oxidation state of a Platinum complex.
I was presented today with the following complex and asked to comment on the oxidation state and hence the d-orbital configuration of the central metal ion:
[![enter image description here][1]][1]
[1]: https://i.stack.im... |
I've lowered tap water ph from 7 to 6 using citric acid. After couple of hours ph raised again to 7. What is the reason for this raise? Citric acid overcomes waters buffering feature then raise the H+ concentration in water. Why ph raise again? |
Despite the absurd lack of data, this problem attracted my attention for some reason, and it looks like it's an adaptation of the problem from *Schaum’s Outline of Theory and Problems of College Chemistry* \[1, p. 39\]:
> **3.37** What is the empirical formula of a catalyst that can be used in the polymerization of ... |
I have a question about the illustration from [chem.libretexts.org](https://chem.libretexts.org/Bookshelves/General_Chemistry/Book%3A_Chem1_(Lower)/15%3A_Thermodynamics_of_Chemical_Equilibria/15.08%3A_Quantum_states%2C_Microstates%2C_and_Energy_spreading_in_Reactions):
> [![Figure 15.8.9. Phase Changes][1]][1]
> ... |
I've lowered tap water pH from 7 to 6 using citric acid. After couple of hours pH raised again to 7.
What is the reason for this raise? Citric acid overcomes waters buffering feature then raise the $\ce{H+}$ concentration in water. Why pH raise again? |
How does hydrogen bonding affect hybridisation of species? I mean in $\ce{B(OH)3}$ the hybridization of boron is $\mathrm{sp^2}$ but in aqueous phase, is the hybridization same or it changes? |
$\ce{VO2}$ is a weird metal which becomes a conductor at temperatures higher than $\pu{67 ^\circ C}$, but below $\pu{67 ^\circ C}$, it is an insulator!
How is this possible anyway? This is against solid state theory and how are we supposed to create band gaps with it? |
Tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate for a redox reaction in the presence of oxygen and H+ proceeding as follows:
$$
4 Fe(2+)/Mn(2+) + O2 + 2 H+ --> 4 Fe(3+)/Mn(3+) + 2 OH-
$$
Reference: See my comments and sources cited [here](https://www.s... |
While reading about the factors affecting the product of Friedel-Crafts Acylation with Acetyl Chloride, I came across a reaction involving napthalene in two different solvents - In nitrobenzene, substitution took place at the beta position, in carbon disulphide, substitution took place at the alpha position. What is th... |
Oxygenated tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate and can drive a redox reaction in the presence of oxygen and H+ proceeding as follows:
$$
4 Fe(2+)/Mn(2+) + O2 + 2 H+ --> 4 Fe(3+)/Mn(3+) + 2 OH-
$$
Reference: See my comments and sources cited... |
I was provided with the following structure of an inorganic metal complex:
[![enter image description here][1]][1]
and asked to give information on its NMR spectrum shown below
[![enter image description here][2]][2]
[1]: https://i.stack.imgur.com/ZEFfg.png
[2]: https://i.stack.imgur.com/Uz63g.png
... |
When referring to a particular atom, both in text and when using a graphical representation, several conventions are being applied.
In the field of crystallography an arabic numeral either follows the element symbol without any space, e.g. $\mathrm{C}42$ for carbon atom number $42$ (usually assigned during solve/ref... |
Despite the absurd lack of data, this problem attracted my attention for some reason, and it looks like it's an adaptation of the problem from *Schaum’s Outline of Theory and Problems of College Chemistry* \[1, p. 39\]:
> **3.37** What is the empirical formula of a catalyst that can be used in the polymerization of ... |
If water potential is nothing but the chemical potential of a given solution, then why do their units differ?
If the unit for the latter is taken as 'Energy per molecule' (which makes sense to me mathematically), then why is the former measured is 'Pressure'(Pascal)? |
I've lowered tap water pH from 7 to 6 using citric acid. After couple of hours pH raised again to 7.
What is the reason for this raise? Citric acid overcomes waters buffering feature then raise the $\ce{H+}$ concentration in water. Why pH raise again?
The pH was measured using a pH meter. |
Despite the absurd lack of data, this problem attracted my attention for some reason, and it looks like it's an adaptation of the problem from *Schaum’s Outline of Theory and Problems of College Chemistry* \[1, p. 39\]:
> **3.37** What is the empirical formula of a catalyst that can be used in the polymerization of ... |
The problem is as follows:
> $5\ \mathrm l$ of oxygen at $2\ \mathrm{atm}$ of pressure and $10\ \mathrm l$ of nitrogen at $4\ \mathrm{atm}$ are collected in a vessel of $2\ \mathrm l$ in capacity. Then $25\ \mathrm l$ of the mixture is released from the vessel at the pressure of $760\ \mathrm{mmHg}$. Find the final ... |
What is the definition of unsaturation?
Do we consider it via baeyers test/ bromine test or
do we need to have atleast one degree of unsaturation?
And if that is so then is benzene an unsaturated hydrocarbon?...cause in benzene it just has the degree of unsaturation. And if we go by that defination...even ketones... |
I want to ask a question about rate constants and their relationship to quantum yields.
I was asked the following question:
> A dye molecule has a singlet excited state lifetime of 0.85 ns. The
quantum yield of triplet formation is 35 %. What is the rate constant for
intersystem crossing from the singlet to th... |
For a solution of $\text{HA-}$, I have seen the following approximations for the pH:
1) $\text{pH}=\frac{1}{2}(\text{pKa1}+\text{pKa2})$
2) $\text{pH}=\sqrt{\frac{(\text{K1}*\text{K2}*\text{[HA-]}+\text{K1}*\text{Kw})}{(\text{K1}+\text{[HA-]})}}$
How do they differ? Is the second approximation always more accu... |
For a solution of $\ce{HA-}$, I have seen the following approximations for the pH:
1) $\textrm{pH}=\frac{1}{2}(\textrm{pKa1}+\textrm{pKa2})$
2) $\textrm{pH}=\sqrt{\frac{\textrm{K1}\times\textrm{K2}\times\ce{[HA-]}+\textrm{K1}\times\textrm{Kw}}{\textrm{K1}+\ce{[HA^-]}}}$
How do they differ? Is the second approx... |
This is a popular piece of confusion, because of a terseness in notation. Basically, we are secretly talking about *two* quantum numbers here: The total magnitude of the electron spin, $S$, and the relative orientation of the electron spins, $M_S$.
As you correctly identify, for the $\alpha\beta + \beta\alpha$ confi... |
It's common to read statements like one given below on [PubChem](https://pubchem.ncbi.nlm.nih.gov/):
>Conformer generation is *disallowed* since ***MMFF94s*** *unsupported* element.
What's the meaning of the statement, and why are certain compounds ***unsupported***? And what is MMFF94s?
This might be something ... |
Why we can't see 3-d structures of certain compounds on PubChem? |
I have recently been reading a paper, in which given dihedral angles of alanine dipeptide molecule $\psi$ and $\phi$, the conformation is catagorized as either $\beta$-1, $\beta$-2, or $\alpha$. I was trying to see if it is possible to extend the same idea to QM9 molecules and cluster them into different groups based o... |
I was provided with the following structure of an inorganic metal complex:
[![Pt metal complex][1]][1]
And asked to give information on its NMR spectrum shown below
[![NMR of Pt metal complex][2]][2]
[1]: https://i.stack.imgur.com/ZEFfg.png
[2]: https://i.stack.imgur.com/Uz63g.png
The highfield ... |
I was provided with the following structure of an inorganic metal complex:
[![Pt metal complex][1]][1]
And asked to give information on its NMR spectrum shown below
[![NMR of Pt metal complex][2]][2]
[1]: https://i.stack.imgur.com/ZEFfg.png
[2]: https://i.stack.imgur.com/Uz63g.png
The highfield ... |
For a solution of $\ce{HA-}$, I have seen the following approximations for the $\mathrm{pH}:$
$$\mathrm{pH} = \frac{1}{2}(\mathrm{p}K_\mathrm{a1} + \mathrm{p}K_\mathrm{a2})\tag{1}$$
$$\mathrm{pH} = \sqrt{\frac{K_1K_2[\ce{HA-}] + K_1K_\mathrm{w}}{K_1 + [\ce{HA-}]}}\tag{2}$$
How do they differ? Is the second app... |
While reading about the factors affecting the product of Friedel–Crafts acylation with acetyl chloride, I came across a reaction involving napthalene in two different solvents: in nitrobenzene substitution took place at the beta position; in carbon disulphide substitution took place at the alpha position.
What is th... |
Why is Diels–Alder adduct exo when we leave it for a while? |
### Question
> A dye molecule has a singlet excited state lifetime of $\pu{0.85 ns}.$ The
quantum yield of triplet formation is $35~\%.$ What is the rate constant for
intersystem crossing from the singlet to the triplet excited state?
### Solution
> $$\mathrm{QY} = \tau_\mathrm{isc}/\tau_0 = 0.35 = \tau_\ma... |
In chair form of cyclohexane the C-H dipole moments cancel out each other but in boat form i don't think all dipole moments will be cancelled out. Also if boat form is polar then what will we say overall about cyclohexane is it polar or nonpolar? |
Is boat form of cyclohexane non polar? |
This is the data given:
$$\ce{MnO4- /Mn^{2+}} = 1.5~\mathrm{V}$$
$$\ce{MnO2 /Mn^{2+}}= 1.23~\mathrm{V}$$
I know that :
$$\ce{MnO4- +5e- + 8H+ ->Mn^{2+}}$$
$$\ce{MnO2 + 4H+ +2e- -> Mn^{2+}}$$
After that here's what's done which I absolutely don't get. After using $\Delta G^\circ = -nFE^\circ$, won't we ... |
Oxygenated tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate and can drive a redox reaction in the presence of oxygen and H+ proceeding as follows:
$$
4 Fe(2+)/Mn(2+) + O2 + 2 H+ --> 4 Fe(3+)/Mn(3+) + 2 OH-
$$
Reference: See my comments and sources cited... |
Oxygenated tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate and can drive a redox reaction in the presence of oxygen and H+ proceeding as follows:
$$
4 Fe(2+)/Mn(2+) + O2 + 2 H+ --> 4 Fe(3+)/Mn(3+) + 2 OH-
$$
Reference: See my comments and sources cited... |
Oxygenated tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate and can drive a redox reaction in the presence of oxygen and H+ proceeding as follows:
$$
4 Fe(2+)/Mn(2+) + O2 + 2 H+ --> 4 Fe(3+)/Mn(3+) + 2 OH-
$$
There is also a likely metal redox couple eq... |
Oxygenated tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate and can drive a redox reaction in the presence of oxygen and H+ proceeding as follows:
$$
4 Fe(2+)/Mn(2+) + O2 + 2 H+ --> 4 Fe(3+)/Mn(3+) + 2 OH-
$$
There is also a likely metal redox couple eq... |
I think the right way to approach this question isn't "*we don't know the product, let's try to reason it out from first principles*"; rather it should be more like "*we found that this is the product when we ran the reaction in the lab, how can we rationalise this observation using a model of nucleophilicity that we k... |
Believe it or not, the causative agent is the Ascorbic acid (presence in pineapple juice), which is known to cause pit corrosion (described [here](https://www.substech.com/dokuwiki/doku.php?id=pitting_corrosion)) with stainless steel! Here is a [source](https://link.springer.com/article/10.1007/s12540-016-5684-7) "Effe... |
When I searched for why the colour absorbed and emitted by coloured transitional elements are different , i found out that the metals absorb the light they need and the remaining is reflected .
But my doubt here is what happens to the absorbed light , i mean will it emit it? If yes, in what form ??
It can't absor... |
Why transition elements specifically show complementary colours? |
My textbook, Harris 7th Edition Quantitative Chemical Analysis, says:
> In titrations involving 1:1 stoichiometry of reactants, the equivalence point is the steepest point of the titration curve. This is true of acid-base, complexometric, and redox titrations as well.
My question is, does this apply to **all** ac... |
Usually Diazo coupling occurs at *para*-position unless the *para*-position is occupied, in which case coupling occurs at *ortho*-position.
While solving questions I found in both the cases as shown, the coupling occurred at *ortho*-position of the $\ce{-OH}$ group:
[![enter image description here][1]][1]
So... |
Diazo Coupling reaction with para-substituted phenol? |
1. The electrons in the antibonding MO are the unpaired electrons of the molecule? E.g. O2, by writing down the diagram for the MO we notice that there are only 2 electrons in the top antibonding orbitals thus 2 unpaired electrons, yet by writing down the Lewis structure, the molecule turns out to have 0 unpaired elect... |
The Lewis model has weaknesses. O2 is a good example of the failure of the Lewis model. It does not give the good structure for the O2 molecule. The Lewis structure of O2 has no unpaired electrons. But the experiment shows that a jet of O2 is deflected in a magnetic field, which can only be explained by the presence of... |
I just started selfstudy with an organic chemistry textbook and I'm not quite getting the motivation behind the octet rule.
Per Bruice's textbook, the octet rule reads
> an atom is most
stable if its outer shell is either filled or contains eight electrons and it has no electrons
of higher energy
In the first... |
1. The electrons in the antibonding MO are the unpaired electrons of the molecule? E.g. $\ce{O2}$, by writing down the diagram for the MO we notice that there are only 2 electrons in the top antibonding orbitals thus 2 unpaired electrons, yet by writing down the Lewis structure, the molecule turns out to have 0 unpaire... |
Despite the absurd lack of data, this problem attracted my attention, probably because it closer resembles a real-life challenge rather than a textbook problem.
It looks like it's an adaptation of the problem from *Schaum’s Outline of Theory and Problems of College Chemistry* \[1, p. 39\]:
> **3.37** What is the em... |
According to me henry's constant $K_h$ should be directly proportional to the effect of temperature.
It is because $K_h$ is inversely proportional to solubility and as we increase temperature solubility decreases and hence $K_h$ value should increase.
But the correct answer is value of $K_h$ also decreases with... |
According to me Henry's constant $K_h$ should be directly proportional to the effect of temperature.
It is because $K_h$ is inversely proportional to solubility and as we increase temperature solubility decreases and hence $K_h$ value should increase.
But the correct answer is value of $K_h$ also decreases with... |
Why do transition elements specifically show complementary colours? |
Ascorbic acid (<b>C<sub>6</sub>H<sub>8</sub>O<sub>6</sub></b>) is commonly used in dough to give it strength and elasticity. However, I need this dough to be alkaline, or at the very least neutral. I've used sodium carbonate (<b>Na<sub>2</sub>CO<sub>3</sub></b>) before for this purpose but never at the same time with a... |
Can ascorbic acid be neutralized and keep it's elastic properties in dough? |
Consider 5-methylcyclopentadiene:
[![5-methylcyclopentadiene][1]][1]
[1]: https://i.stack.imgur.com/fgifl.png
If HX attacks at carbon 1, we have an option of 1,2 or 1,4 (carbocation resonance) addition. In the case of 1,4 addition, since the carbocation (secondary) will be one bond away from a tertiary car... |
Can a reaction have carbocation resonance followed by a hydride shift? |
When I am searching the colour of Mg3N2 I came across photoes showing Greenish Yellow(https://upload.wikimedia.org/wikipedia/commons/7/7b/Magnesium_nitride.jpg)
and some other Just yellow(https://www.google.com/search?q=magnesium+nitride&client=ms-android-samsung-gj-rev1&prmd=ivn&sxsrf=ACYBGNSoIGFwKl13pCTUnuLG56Z3A... |
Why the colour of same compound (e.g.Mg3N2) differs? |
When I am searching the colour of Mg3N2 I came across photoes showing
GreenishYellow
(https://upload.wikimedia.org/wikipedia/commons/7/7b/Magnesium_nitride.jpg)
and some other Just yellow
(https://www.google.com/search?q=magnesium+nitride&client=ms-android-samsung-gj-rev1&prmd=ivn&sxsrf=ACYBGNSoIGFwKl13pCTUnuL... |
Which has a greater dipole moment: methylamine ($\ce{CH3NH2}$) or methanol ($\ce{CH3OH}$)? |
Which has a greater dipole moment: methylamine ($\ce(CH3NH2)$) or methanol ($\ce(CH3OH)$)? |
I am looking for a good similarity measure between molecules in order to use it with machine learning algorithms. I found a paper, *Carbó, R., Leyda, L. and Arnau, M. (1980), How similar is a molecule to another? An electron density measure of similarity between two molecular structures. Int. J. Quantum Chem., 17: 1185... |
Is electron density a good measure of similarity between molecules? |
COx are part of the oxocarbon molecule class. Commonly known are CO and CO2. However, there are molecules in which x is equal to or larger than 3. Those molecules are barely known, other than the fact that they're unstable. CO3 decomposes slowly enough that it may come into contact with other molecules (including biomo... |
What are the properties of COx where x is ≥3? |
$\ce{CO_x}$ are part of the oxocarbon molecule class. Commonly known are $\ce{CO}$ and $\ce{CO2}.$ However, there are molecules in which $x$ is equal to or larger than $3.$ Those molecules are barely known, other than the fact that they're unstable.
$\ce{CO3}$ decomposes slowly enough that it may come into contact ... |
What are the properties of COₓ where x ≥ 3? |
Which has a greater dipole moment: methylamine $(\ce{CH3NH2})$ or methanol $(\ce{CH3OH})?$ |
Which has a greater dipole moment: methylamine or methanol? |
When I am searching the colour of $\ce{Mg3N2}$ I came across photos showing different colours: **greenish-yellow** on [Wikimedia](https://upload.wikimedia.org/wikipedia/commons/7/7b/Magnesium_nitride.jpg),
and some other **just yellow** on [some Google Photos results](https://www.google.com/search?tbm=isch&q=magnesium... |
Why does the colour of the same compound (e.g. magnesium nitride) differ? |
Despite the absurd lack of data, this problem attracted my attention, probably because it closer resembles a real-life challenge rather than a textbook problem.
It looks like it's an adaptation of the problem from *Schaum’s Outline of Theory and Problems of College Chemistry* \[1, p. 39\]:
> **3.37** What is the em... |
In Kryptomerism assignment, there was a question to compare more stable tautomeric form between 4-pyridone and 4-pyridinol.
**Answer** 4-pyridone
My friend gave two plau... |
In Kryptomerism assignment, there was a question to compare more stable tautomeric form between 4-pyridone and 4-pyridinol.
**Answer** 4-pyridone
My friend gave two plau... |
When I am searching the colour of $\ce{Mg3N2}$ I came across photos showing different colours: **greenish-yellow** on [Wikimedia](https://upload.wikimedia.org/wikipedia/commons/7/7b/Magnesium_nitride.jpg),
and some other **just yellow** on [some Google Images results](https://www.google.com/search?tbm=isch&q=magnesium... |
In kryptomerism assignment, there was a question to compare more stable tautomeric form between 4-pyridone (**1**) and 4-pyridinol (**2**):
[![1: 4-pyridone; 2: 4-pyridinol][1]][1]
**Answer**: 4-pyridone.
My friend gave two plausible reasons:
1. $\ce{C=O},$ is more stable than $\ce{C=N}.$
2. $\ce{-N=}$ w... |
I found this problem in my book and I'm not sure how to assess this question.
It is as follows:
> Regarding the relationship between the rates of the chemical species
> in the following reaction. Which of the following alternatives is the
> correct one?
$\ce{2H2 + O2 -> 2 H2O}$
$\begin{array}{ll}
1.&v_{H... |
Does the concentration of water accounts for determining the rate of a reaction? |
This is just out of curiosity. I have no intention or authority to do conversions.
I am studying chemistry of tranquilizers, in that an important class is of barbiturates, which are also hypnotics. The structure of Barbituric acid and veronal, are similar, except veronal has two ethyl groups instead of hydrogen at l... |
I found this problem in my book and I'm not sure how to assess this question.
It is as follows:
> Regarding the relationship between the rates of the chemical species
> in the following reaction. Which of the following alternatives is the
> correct one?
$\ce{2H2 + O2 -> 2 H2O}$
$\begin{array}{ll}
1.&v_{H... |
We know when Lithium is burnt in air it forms Lithium Nitride and Lithium Oxide. I am wondering is these reality apllies for Aluminium(other metals) also? |
When Aluminium is Ignited in atmosphere, will it form only Aluminium oxide or also Aluminium nitride? |
In the structure of NAD+, why does the nitrogen of pyridine bind covalently to the the first carbon of glucose while the anion stabilizing the nicotine amide ion is the phosphate group? In other words, why didn't NAD+ exist as an ionic salt between nicotine amide ion and phosphate ion in the nucleotide? |
According to this [paper][1], it is indeed formed when burning aluminium, but you could have predicted this simply by considering the standard enthalpy of formation of aluminium oxide ( $\ce{Al2O3}$ = -1675.7 kj/mol ) which will be liberated upon ignition and this energy is enough to break the strong Nitrogen-Nitrogen ... |
>Since the equilibrium constant for the formation of the complex ion is very large, I assume that $\ce{[Ni(CN)4^{2-}] >> [Ni^{2+}]}$
From the comments:
> [comments:] That assumption is incorrect. The equilibrium constant seems large, but the exponents are high, so it is misleading. In fact, more of the cyanide is... |
> What is the pH when $0.025$ mol $\ce{NiCl2}$ is added to $\pu{1.00 L}$ of a $\pu{0.100 M}$ solution of $\ce{HCN}$, if the formation constant for $\ce{Ni(CN)4^2-}$ is $K_f=\pu{1.0e22}$, and the $K_a$ for $\ce{HCN}$ is $\pu{4.9e-10}$?
My approach is as follows:
1) $\ce{\frac{[H+][CN-]}{[HCN]}=4.9*10^{-10}}$
2)... |
> So, for water below 0 degrees to freeze, it must first accept heat from somewhere, to reach zero degrees.
No, water can freeze at lower temperatures, see e.g. https://www.youtube.com/watch?v=Fot3m7kyLn4.
As it freezes, the exothermic process warms up the ice and the surrounding water. The difference in enthalpy... |
According to this [paper][1], it is indeed formed when burning aluminium, but you could have predicted this simply by considering the standard enthalpy of formation of aluminium oxide ( $\ce{Al2O3}$ = -1675.7 kj/mol ) which will be liberated upon ignition and this energy helps in breaking the strong Nitrogen-Nitrogen t... |
We know when Lithium is burnt in air it forms Lithium Nitride and Lithium Oxide. I am wondering if is this applies for Aluminium (other metals) also? |
[![The Question][1]][1]
[1]: https://i.stack.imgur.com/ktvFH.png
The image and the title are very self explanatory.
I figured out that, (4)th compound is very symmetric - so net dipole moment on the compound must be null.
How should I go about finding the compound with the highest dipole moment? Any help ... |
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