# Questions tagged [kinetic-theory-of-gases]

Questions about the assumptions, equations, and properties of gases derived from kinetic theory. For questions pertaining to rates of reactions, please use the kinetics tag instead.

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### When a gas is expanded, why doesn't the number of moles of a gas increase despite it's volume increasing (doubt in JEE sample question) [closed]

This question might be elementary, but it is genuine. I realise that some users might downvote the question for being so basic, but I urge them to be a little merciful, and help out a confused high ...
244 views

### Can a heated gas leave a container through downwards direction?

If I have a flask full of heated gas, with an opening at the BOTTOM of the flask and connected pipe facing downwards, can the heated gas can leave the flask through that opening? And for an alternate ...
1 vote
93 views

### In collision theory why we multiply collision frequency by N/2?

In kinetic theory of gases we know that the average number of collisions, $N_\mathrm{col}$, is given by $$N_\mathrm{col} = \sqrt{2\pi\sigma^2 \overline{v}_\mathrm{rel}}\ N$$ where $N$ is the number ...
70 views

### Kinetic energy change in reaction

If we consider a reaction occurring at constant pressure and temperature , we know that enthalpy represent the net heat released or absorbed by the system and internal energy accounts for both heat ...
196 views

### Non-Arrhenius temperature dependence of bimolecular reaction rates at very high temperatures

Once I have read that in some cases bimolecular reactions can exhibit a maximum as a function of temperature due to the short lifetime of the activated complex at very high temperatures. At low ...
103 views

### RMS Speed of Gases as Standard Deviation

In kinetic molecular theory, the average velocity of gas particle is zero since the molecule move in different directions, and the overall effect is zero. Howeever, you can calculate different speeds. ...
101 views

### Validly of the equation, du= nCv dt, for an adiabatic process

In an adiabatic process, there is no heat exchange, hence, $Q=0$. The equation $\mathrm dU=nC_V\,\mathrm dT$ is valid for every type of process given the gas is ideal, where $C_V$ is heat at constant ...
96 views

### Probability distribution for the momentum of a particle undergoing a collision?

Background I haven't seen this mauver done before but let's say, I have a thermal gas and I have a molecule with momentum $\vec p$. It undergoes a collision and now has momentum $\vec P$. Now, due to ...
158 views

### Is it Rigorous to Derive the Arrhenius Exponential Term from the Boltzmann Distribution?

The Boltzmann distribution is a probability density function which expresses the probability of finding a particle in an energy state $\epsilon$ while in thermal equilibrium given a specific ...
1 vote
184 views

### Why is the isenthalpic condition required in the Joule–Thomson effect?

I have been struggling to understand how the molecules behave during the Joule–Thomson effect. I would love to get some help on this concept. Here is what I got so far. Under adiabatic and isenthalpic ...
293 views

### Average molecular distance between hydrogen gas [closed]

The whole question goes like this: Calculate the de Broglie wavelength of hydrogen molecule at 300K (Take the translational energy to be 1.5kT) Compare this to the average intermolecular spacing for ...
78 views

### What is the average collision duration?

So I've been trying to figure this out: What is the average collision duration of a gas in terms of macroscopic variables? What I have figured out. Whenever two molecules collide they must reach a ...
43 views

### What ideal gas behavior is observed by a real gas that observes Boyle's law (at Boyle's temperature)?

Boyle's temperature is a constant for a particular gas. At this temperature the real gas behaves ideally. So, does the real gas only follow Boyle's law at this temperature, or are all the gas laws ...
514 views

### Why do we subtract the volume correction term in the van der Waals gas equation [duplicate]

The following equation is valid for ideal gasses $$pV=nRT$$ Please mind the following notation, any parameter that is related to an ideal gas would be denoted with a subscript $i$ and anything related ...
615 views

### Confusion in Van der Waals Equation

I understand that the behavior of ideal gases deviates largely from that of real gases in terms of pressure exerted by the gas molecules on the container in which it is present, space available for ...
1 vote
195 views