# Tag Info

Accepted

• 42.9k

### Question about chemical potential of a multicomponent ideal gas

If you first divide the space into two with a wall, the chemical potential will be the same, and the sum of the Gibbs energies will be the same as the original Gibbs energy. Then, you mark the ...
• 41.3k

### Question on Nernst equation

Let assume the classical representative of cells – the Daniell's cell: $$\ce{Zn(s)}|\ce{ZnSO4(aq)}||\ce{CuSO4(aq)}|\ce{Cu(s)}$$ \begin{align} E_\mathrm{cell} &= \Delta E^{\circ} + \frac{RT}{nF} \...
• 42.9k

### How to experimentally determine the chemical potential of salt water?

A simple aqueous salt solution contains water and salt. One does not generally discuss the "chemical potential of a solution" but rather that of the individual components. Chemical potential ...
• 22.6k
Accepted

### Do high-energy chemical bonds indicate strong chemical bonds?

There are two factors here to consider. First, the energy released by a given reaction is (partly) due to the difference between the bond strength in the product vs reactant, not the absolute bond ...
• 10.4k

### Is equilibrium point for a coupled equilibria of arbitary number of coupled reactions is a unique point?

One of the first experimental demonstrations that the same equilibrium point is reached if the reaction starts with all reactants or all products was $\ce{2HI<=>I_2 + H_2}$ made by Bodenstein in ...
• 30.9k

### Equilibrium chemical potential if the population is not conserved?

This question is either confused or simply confusing. The concept of equilibrium implies reactant and products and energy interacting so that everything remains constant and cannot be applied to a one ...
• 2,320
Accepted

### What if kc=1 will reactants concentration equals to product concentration

You reasoning is correct, $K_c = 1$ doesn't necessarily mean the reactant and product concentrations are equal. Consider a general reaction: $$\sum_ir_i\ce{R}_i \ce{->} \sum_jp_j\ce{P}_j$$ The ...
• 2,304

### Thermodynamics potential and differences between them

Note that the term state function is more common that the thermodynamic potential, while both are correct. Considering $U$, $H$, $F$ and $G$ as different forms of energy may be misleading. The state ...
• 42.9k
Accepted

### If gaseous oxygen and dissolved oxygen (in water) have the same partial pressure, will they diffuse into solid materials at comparable rate?

If the air and water are in equilibrium, then che chemical potential of the oxygen in the air is equal to the chemical potential of the oxygen in the water. If either is placed in contact with your ...
• 13.5k

### Physical significance of chemical potential and fugacity

The chemical potential is the partial derivative of the Gibbs free energy with respect to the number of moles of the specified species at constant T, P, and numbers of moles of all other species. The ...
• 13.5k
1 vote
Accepted

### How is dG=0 employed to describe equilibrium in constant volume systems?

The chemical potential appears in the definitions of all of the thermodynamic potentials: $$U=-pV+TS+\sum_i \mu_i n_i$$ $$H= TS+\sum_i \mu_i n_i$$ $$A=-pV+\sum_i \mu_i n_i$$ $$G=\sum_i \mu_i n_i$$ The ...
• 22.6k
1 vote

### What exactly happens in a Chemical Potential Energy Graph?

It is just potential energy: the potential energy needed for the reaction to happen. This potential energy obviously needs to come from somewhere, and that's where kinetic energy comes in. If the ...
• 284
1 vote
Accepted

### How to apply a certain voltage vs SHE

You have to use 3-electrode system, with 2 power electrodes and the SHE as the reference electrode. The problem is that if you apply the external voltage 3 V on both power electrodes, their potential ...
• 42.9k
1 vote

### Equilibrium chemical potential if the population is not conserved?

At equilibrium, the number of each species is constant. So if a molecule falls appart into two fragments, these fragments would recombine at the same rate. Thermodynamics is for looking at bulk ...
• 41.3k
1 vote
Accepted

### Enthalpy in the van't Hoff equation

Good question. Enthalpy of reaction dependence on temperature is given by Kirchoff's equation (you can check it) and it is true that enthalpy of reaction changes with temperature. For most reactions ...
• 865
1 vote

### Ordered and random energy

Consider the ability to predict something in a detailed manner as synonymous with "ordered", and the inability synonymous with "random". For instance, a perfect crystalline solid ...
• 22.6k
1 vote

### Physical significance of chemical potential and fugacity

In less mathematical terms, the chemical potential of a component in a mixture at a specific temperature and pressure is the amount of free energy that can be ascribed to one mole of that component ...
• 22.6k
1 vote

### Chemical potential and gibbs free energy

There are at least two fundamental issues you have to address. First, you have to distinguish between the Gibbs energy $G$ and the Gibbs energy of reaction $\Delta_r G$. In you diagram, one is the ...
• 41.3k
1 vote
Accepted

### Chemical potential and gibbs free energy

I can't see what you did in your derivation, but, for what it's worth, here's my derivation. My starting equations are $$G=\sum{n_i\mu_i}$$and, along your contour, at constant temperature and pressure,...
• 13.5k

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