# Questions tagged [physical-chemistry]

The study of chemical systems using the laws and concepts of physics. This usually requires the techniques of thermodynamics, statistical mechanics and quantum mechanics.

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### Molar volume of salt

A 4% (weight percent) solution of a salt with Mr = 189.6 g mol-1 was prepared at 25 0C. The density of the prepared solution was 1.00926 g cm-3. The density of water at 25 0C is 0.99707 g cm-3, and ...
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### How to find out equivalent to about 2 mg of sodium in sodium metabisulphite? [closed]

How to find out equivalent to 2mg of sodium in sodium metabisulphite? Please help to find out this problem.
32 views

### Entropy of a van der Waals' gas

I would like to ask how I could derive the entropy change $dS$ for a van der Waals' gas. I think I would need to use the total differential of entropy and then use the Maxwell relation shown below. ...
31 views

### How can I solve for the volume that is required to solve for the work due to vaporization?

Problem A sample of ice weighing $\pu{18.02 g},$ initially at $\pu{-30.0 °C},$ is heated to $\pu{140.0 °C}$ at a constant pressure of $\pu{1.00 atm}.$ Calculate $q,$ $w,$ $ΔE,$ $ΔH,$ and $ΔS$ for ...
40 views

### Meaning of 'constant T and p'

In chemical thermodynamics, the condition "constant temperature and pressure" appears almost everywhere. However, I felt a small ambiguity in the phrase so I wanted to clear my doubts. When ...
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### About covalant bound for molecule : repulsion of electrons?

I try to understand, from the electromagnetic side only, how the molecule could be more stable than each atom, and concluded that it could not. Where is my mistake ? Here is an illustration : By using ...
26 views

### Calculating commutator of parity operator and e^(d/dx) [closed]

How do we evaluate the commutator of the above? If they commute, we could prove that the linear translation operator and the parity operator also commute. Intuitively it makes sense because, P(x-a)=-x-...
26 views

### How does solutions of two liquids work?

I'll start by establishing my potentially flawed understanding of solutions: A solution is a completely homogenous mixture. That means that the two (or more) substances are evenly distributed ...
I'm trying to visualize a simultaneously adiabatic and isothermal process like large amounts of an ideal gas in a vacuum. As I understand, $\delta Q = 0$ in adiabatic processes, and $T$ is constant ...