New answers tagged physical-chemistry
-4
From what I learned here and at MathOverflow, where this question was originally posted, I deduce that the answer to it is “no”. I.e. the mathematical proof of the Mendeleev table was not found by now. I am sorry to inform you, dear physicists. And this has nothing in common with the nuances you are talking about, in particular with the problem of ...
2
$\text{m}\Omega ^{-1}$, means milli-S, that means the resistivity is in the range of kilo-Ohm. What's the problem?
Apparently, the curve in your post shows very low conductivity compared to Cu.
1
Is ethanol leaving the liquid?
Yes
Does the pressure add energy to the ethanol molecules causing them to gasify and move rapidly near border of gas/liquid and rapid depressurization allows it to escape the liquid and turn back liquid, this time as mist/vapor?
No
Is the added pressure needed?
No
Would same thing happen if we'd rapidly depressurize it ...
2
The partial pressure of ethanol in the air space above the beer would be approximately given by Raoult's Law. The vapour pressure of ethanol at 20°C is about 5.4kPa and water at the same temperature is 2.3kPa. The percentage by volume of ethanol in Budweiser is 5%, which is about 4% by weight or a mole fraction of 0.016. So the partial pressure of the ...
2
I answered a question much like this in my Chemistry finals, and that was a several page essay. You'll excuse me if this answer is a rather shorter!
The definitive way to measure molecular size is X-Ray crystallography. This gives you the structure of the crystal including the positions of all the atoms, so you automatically get the molecule size. This ...
1
The order of magnitude given by Gugg is correct. The molar volume for the succinic acid is
$V_m=\frac{M}{\rho}=\frac{118.09}{1.59}\frac{cm^3}{mol}=74.27cm^{3}/mol$
where $M$ is the molar mass and $\rho$ the density. From this, you find the volume of the molecule to be
$V_{molec}=\frac{V_m}{N_A}=1.23\cdot10^{-22}cm^3 $
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