All Questions
Tagged with experimental-chemistry thermodynamics
38
questions
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25
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visualization problem of dilution of enthalpy $\Delta_{dil} H$ data with different initial concentrations
description
I have a question about the $m_f$ vs. $\Delta_{\text{dil}} H$ plot in some experimental studies.
For example, the dilution-of-enthalpy data at 300 °C with two initial concetration ($m_i$) ...
- 73
3
votes
1
answer
129
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Understanding Rossini and Frandsen experiment for measuring $(\partial u/\partial P)_T$?
In another question, I asked about the theoretical justification for the experiment that I will describe in what follows.
The experiment was done by Rossini and Frandsen in 1932 at the National Bureau ...
- 168
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1
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153
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What meaning does Gibbs energy acquire when applied to solutions?
I have been picturing functions like enthalpy and Gibbs free energy as mathematical tools, which were defined in such a way as to be useful for some specific cases. I understood enthalpy as a useful ...
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-3
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1
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76
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Can someone help me with the experimental tabulation or spread sheet data on enthalpy, temperature, and pressure for aluminum and oxygen combustion [closed]
I need an experimental tabulation or spread sheet data of enthalpy, temperature, and pressure tabulated in columns for aluminum and oxygen combustion under non standard conditions.
Any references to ...
- 15
2
votes
1
answer
939
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how to improve self-constructed calorimeter (heat insulation)
Purpose:
My purpose of this project is to use some environmental friendly material to construct calorimeter instead of using styrofoam.
I tried:
I use two different size test tube as my calorimeter(as ...
- 21
3
votes
1
answer
177
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Are solid fuels with calorific values >= 10,000 kcal/kg (42 MJ/kg) physically possible?
I have seen laboratory documentation from a reputable lab in southeast Asia that a company has achieved a solid fuel product made from landfill material with a high heating calorific value ($CV$) of ...
- 500
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0
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68
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How can the heat equation be used to model temperature vs time in a solubility experiment?
Background:
I am doing experiments trying to map the practical solubility of a certain chemical species called an "activator" solution. This solution is essentially a sequential mixture of ...
- 500
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1
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130
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How does Hess' Law work exactly? [closed]
So I am talking about complicated compounds and not simple reactions where you subtract heats of formation. I was trying to find the heat of reaction for an aryl substituted methyl aryl sulfide being ...
- 127
3
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1
answer
168
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How can combusted methane from landfill samples be quantified?
Background:
For my studies I'm wanting and attempting to make a landfill greenhouse gas emissions (GHG) model that predicts the amount of greenhouse gas equivalent emissions ($GHG_\mathrm{eq}$ [tonnes/...
- 500
-1
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1
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46
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What would happen if I increase the pressure and temperature of a gas present in a container
Assume the gas to be a real gas and the container to be made of diamond or anything stronger than that. Take the amount of gas to be 2mL and the pressure is increased with the help of strongest ...
- 11
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2
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83
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Enthalpy vs. delta enthalpy
I haven’t really found a clear answer.
Enthalpy is measured as the sum of internal energy (kinetic and potential energy) and pressure times volume. However, I don’t really see the value of measuring ...
- 99
1
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2
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386
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Triple Point of a compound and critical point
Is it necessary for all compounds to have a triple point? Also, how is the triple point determined?
Suppose a substance does not have a triple point, so how do researchers agree on the impossibility ...
- 682
-4
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2
answers
310
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Feasibility of a chemistry experiment involving combustion vegetable oil and fuel [closed]
As a part of a chemistry experiment I would like to see the effect on the enthalpy of combustion of a mixture of vegetable oil and gasoline/diesel fuel when its percentage composition is changed (i.e ...
4
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2
answers
4k
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How are reaction enthalpy and entropy affected by temperature
The equation for Gibbs Free Energy demonstrates how the standard change in Gibbs Free Energy for a reaction is affected by temperature.
$$\Delta G^\circ = \Delta H^\circ - T\,\Delta S^\circ$$
...
- 71
0
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3
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138
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Why does a NOx container get cold when NOx is released? and What is the relationship of the vapor pressure curve with the liquid-vapor dome?
The temperature at which $\ce{NO_x}$ is in equilibrium with its liquid and vapor phase at 1 atm is about –84 °C. Does that mean $\ce{NO_x}$ exists as a liquid at that temperature? What about it's ...
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