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Thermo Paper

The document is an exam for a materials thermodynamics and kinetics course consisting of 6 questions worth a total of 20 marks. The questions cover calculating changes in entropy when compartments are removed, proving a thermodynamic equation, calculating standard enthalpy and entropy changes for a reaction, deriving the Clausius-Clapeyron equation, determining if a Zn-Cd solution exhibits regular behavior and calculating various thermodynamic properties of the solution.

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Somya Kabra
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26 views1 page

Thermo Paper

The document is an exam for a materials thermodynamics and kinetics course consisting of 6 questions worth a total of 20 marks. The questions cover calculating changes in entropy when compartments are removed, proving a thermodynamic equation, calculating standard enthalpy and entropy changes for a reaction, deriving the Clausius-Clapeyron equation, determining if a Zn-Cd solution exhibits regular behavior and calculating various thermodynamic properties of the solution.

Uploaded by

Somya Kabra
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Department of Metallurgical and Materials Engineering

End Semester Examination, 10 th Jan., 2021; Materials Thermodynamics and Kinetics,


Total Marks: 20, 10:00 AM to 02:00 PM

Note: A. Show all the steps of the calculation clearly-No credit without the intermediate
steps.

1. A rigid container is divided into two compartments of equal volume by a partition. One
compartment contains 1 mole of ideal gas A at 1 atm, and the other contains 1 mole of
ideal gas B at 1 atm. Calculate the increase in entropy which occurs when the partition
between the two compartments is removed. (3)

2. Prove that [{∂/∂V(∂U/∂V)}at constant T] - [{∂/∂P(∂U/∂P)}at constant T] =


P[{∂/∂P(∂V/∂P)}at constant T] +2 {(∂V/∂P) at constant T] (3)

3. Calculate the standard enthalpy and entropy changes at 25 C (298 K) for the
reaction

2<Cu> + 1/2(02) = <Cu20>

∆G0 = -40,500 -1.702 T ln T +29.5 T cal

(3)

4. Derive Clausius-Clapeyron equation. (3)

5. From the e.m.f. measurements at 527 C (800 K) the following values of the activity
coefficient of cadmium in zinc-cadmium solutions have been obtained:

XCd 0.2 0.3 0.4 0.5


γCd 2.153 1.817 1.544 1.352

a. Determine whether the Zn-Cd solution exhibits regular behaviour. (2)


b. Calculate the values of the partial molar heat of mixing of Zn and Cd (2)
c. Integral molar heat of mixing (1)
d. Integral molar entropy of mixing (1)
e. Partial molar Gibbs free energy of mixing of cadmium and (1)
f. Integral molar free energy of mixing (1)
for an equiatomic solution of Zn-Cd assuming regular behaviour at 527 C (800 K).

ʃʃʃ

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