Questions tagged [isotherm]

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Does Adsorption Depend On Shape Of The Adsorbent?

I was reading about the Freundlich adsorption isotherm and when I read the equation I was quite confused. It states that $$x/m=k(p)^{1/n}$$ So basically x is mass of the adsorbate adsorbed, m is mass ...
AlphaK's user avatar
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Doubt regarding isothermal reversible process- Thermodynamics

Since its a reversible process, I can say $P_{ext}=P_{int}\pm dP$ so now $W_{int}=\int_{V_1}^{V_2} P_{int}dV$ My question is why can't I assume $P_{ext}=P_{int}$ here and take it as a constant ...
Rexquiem's user avatar
2 votes
1 answer

Why is the work done on the system not equal in frame of gas and surroundings?

Consider an isothermal irreversible process for an ideal gas in a cylindrical container closed with a piston (system). Initial and final states are $(P_1,V_1,T)$ and $(P_2,V_2,T)$ respectively. ...
Leibniz-Z's user avatar
  • 208
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2 answers

How exactly is heat supplied in an isothermal process

How exactly is heat supplied in an reversible isothermal process. If the temperature of system and surroundings always remains the same, then how come surrounding is supplying heat? I studied that T ...
Shashank j's user avatar
6 votes
0 answers

Do "pseudo Van der Waals" gases exist?

In college, when deriving the Langmuir isotherm for gas-solid adsorption, the professor proposed a modified version of the Van der Waals state equation, what he called the "pseudo Van der Waals ...
David Moldes's user avatar
4 votes
1 answer

Understanding isosteric enthalpy (heat) of adsorption

I am trying to understand what is isosteric heat of adsorption. Based on van't Hoff equation: $$ \left(\frac{\partial \ln K}{\partial T}\right)_θ = \frac{ΔH^\circ}{RT^2} $$ and $ΔH^\circ$ is defined ...
Anton's user avatar
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Virial expansion of real gas equation and volume work

Hi I am currently working on a thermodynamics problem, and it asks me to first find the volume work done on a gas that behaves like the simplified Dieterici equation (see below) predicts on isothermal ...
maschine's user avatar
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Can PV vs P plot be called an isotherm?

Normally we call plots drawn at constant temperature as isotherms, e.g. $P$ vs $V$ plot, Langmuir isotherm etc. Using that logic, shouldn't the $PV$ vs $P$ plots also be called isotherms? Personally, ...
Sujay Ghosh's user avatar
1 vote
1 answer

Justifying assumptions about method to find equilibrium pressure for co-existence of graphite and diamond

The standard state Gibbs free energies of formation of $\ce{C(graphite)}$ and $\ce{C(diamond)}$ at $T = \pu{298 K}$ are $\pu{0 kJ mol-1}$ and $\pu{2.9 kJ mol-1}$, respectively. The conversion of ...
tryst with freedom's user avatar
2 votes
0 answers

Entropy of free expansion and isothermal process

Let me tell what I understand of the concepts on which the question is based first. Heat is a flow of energy that takes place due to a temperature gradient. When doing reversible isothermal expansion ...
Aseem Mittal's user avatar
1 vote
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Interpreting a thermodynamics equation using a picture

Given $$ \frac{\partial \Gamma}{\partial p}\Bigg|_{t} =\frac{\partial \Gamma}{\partial p}\Bigg|_{v}+\frac{\partial v}{\partial p}\Bigg|_{t}\frac{\partial \Gamma}{\partial v}\Bigg|_{p} \tag{1}$$ where \...
hexaquark's user avatar
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Finding the Freundlich adsorption isotherm from the graph of log(x/m) v/s log(p)

The following problem was asked in JEE Mains 2020 (Sept 2, Shift 1), The mass of gas adsorbed, $x$, per unit mass of adsorbate, $m$, was measured at various pressures, $p$. A graph between $\log\frac ...
Rahul Verma's user avatar
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