# 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 ...
• 11.5k
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 ...
• 26.8k
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 ...
• 26.8k
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 ...
• 7,591
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 ...
• 38.1k
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 ...
• 2,942
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 ...
• 18.6k

### 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 ...
• 1,135
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 ...
• 11.8k
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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