Determine Enthelpy, Entropy, and Chemical Potential

In summary, the problem given requires determining the Enthalpy, Entropy, and Chemical Potential for an isothermal transition of nitrogen (N2) at a constant temperature of 700K, with initial pressure p1=1bar and final pressure p2=100bar. However, the use of any equations of state, such as Benedict-Webb-Rubin or Beattie-Bridgeman, is not allowed. Instead, only Cp data for nitrogen is given in a table. The equation provided is R*T(a + b v^-1 + c v^-2 + d v^-3) and it is unclear how to apply it to the problem. Further information is needed to determine the values of dh, ds,
  • #1
deltasmile
1
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Homework Statement


Hello, i am given an isothermal transition for nitrogen, N2, where temperature is constant at 700K, p1=1bar, and p2=100bar.
For this problem i am not allowed to use any equations of states, such as Benedict-Webb-Rubin, or Beattie-Bridgeman. Rather i am given only Cp data, which is in the table below. From only this data below for nitrogen i must determine the Enthalpy, Entropy, and Chemical Potential for the transition phase.
I am also given the equation below, which I am not too sure how to apply it to the problem.

Homework Equations


R*T (a + b v^-1 + c v^-2 + d v^-3)
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  • #2
Start with definitions of the ΔH, ΔS and ΔG.
 
  • #3
What are dh, ds, and dg in terms of dT and dP?
 
  • #4
##\Delta G## is easy, but I still haven't figured out how to get ##\Delta H## and ##\Delta S##. Are you sure this is the only information they give you? Do they provide any information at any other temperature?
 
  • #5
I'm guessing that the expression appearing above the table is the functional form they are recommending for the pressure. This is the equation of state. Am I correct?
 
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1. What is enthalpy and how is it determined?

Enthalpy is a measure of the total energy of a thermodynamic system. It can be determined by measuring the heat released or absorbed during a chemical reaction at constant pressure.

2. How is entropy calculated and why is it important?

Entropy is a measure of the disorder or randomness of a system. It is calculated using the change in heat and temperature of a system. It is important because it helps us understand the spontaneity and direction of chemical reactions.

3. What is chemical potential and how does it relate to enthalpy and entropy?

Chemical potential is the energy required to add one mole of a substance to a system at constant temperature and pressure. It is related to enthalpy and entropy through the equation: chemical potential = enthalpy - temperature x entropy.

4. Can enthalpy, entropy, and chemical potential change over time?

Yes, enthalpy, entropy, and chemical potential can change over time depending on the conditions of the system. Chemical reactions, changes in temperature and pressure, and addition or removal of substances can all cause changes in these values.

5. How are enthalpy, entropy, and chemical potential used in practical applications?

Enthalpy, entropy, and chemical potential are used in various fields such as chemistry, physics, and engineering to understand and predict the behavior of systems and reactions. They are particularly important in chemical and industrial processes, as well as in the development of new materials and technologies.

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