# Tag Info

Accepted

### Mathematical models of Vaporization-Condensation dynamics

What you're trying to develop is a kinetic model of a gas-liquid equilibrium. There are are such models, but I'm afraid yours won't work. The reason your model won't work is that it says the rate of ...
Accepted

### Atomization enthalpy trends. The case of Phosphorus

I don't think I can give a canonical answer, but here are some quick thoughts: Breaking intermolecular interactions almost always requires significantly less energy than breaking covalent or ionic ...
Accepted

### Would laying an atom thick piezoelectric material near a heat source generate current?

tldr: not quite, but there are a lot of interesting applications You're correct that a piezoelectric material interconverts mechanical energy into electrical energy. Importantly, there's both: direct ...
Accepted

### Understanding the molar free energy to simulate phase separations (Na2O-SiO2)

In an Ideal solution, based on how many ways one can randomly arrange the constituents, one gets: $\Delta S_{mix} = -R(X_{A} \ln{X_{A}} + X_{B} \ln{X_{B}})$ with $X_{A}+X_{B} = 1$ being the relative ...
Accepted

### Is helium-4 a liquid at zero temperature and zero pressure?

It could be that the liquid-vapor line does not exactly hit zero pressure at any temperature above absolute zero, the pressure just becomes too small to distinguish on the graph. You might see the ...
Accepted

### Can general purpose compressors be used for a specific gas without modification?

Yes, without further specifics. Assuming you mean a modest size reciprocal type. As commented, there are special consideration for primarily hydrogen or oxygen, and of course if there are specific ...
Accepted

### Finding relation between Gibb's free energy and equilibrium constant for a homogeneous gaseous phase reaction

It's sometimes not obvious because of the way the subject may be taught, but $\Delta_rG$ is what's called a differential form, so it actually describes how the free energy changes as the reaction ...

### Why is octasulfur present in equation for standard enthalpy of formation of sulfuric acid?

Here is a definition of standard enthalpy of formation from Wikipedia. The standard enthalpy of a compound is the change of enthalpy in formation of one mole of the substance from its constituent ...
1 vote
Accepted

### Gibbs free energy for an irreversible process

For a process at constant T and P in which no non-expansion work is done, $$\Delta U=Q-P\Delta V$$ and $$\Delta S=\frac{Q}{T}+\sigma$$where $\sigma$ is the irreversibly generated entropy. Combining ...
1 vote

### Maxwell's Relations and Differentiating With Respect to Nᵢ

Just now getting back around to this. \begin{align} \mathrm{d}U(S, V, \left \{ N_i \right \}) &= T\mathrm{d}S - P\mathrm{d}V + \sum_{i}\mu _i\mathrm{d}N_i\\ \mathrm{d}U(S, V, \left \{ ...

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