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Chemical Engineering - Chemical Engineering Thermodynamics - Discussion

Discussion Forum : Chemical Engineering Thermodynamics - Section 8 (Q.No. 4)
Chemical Engineering Thermodynamics
4.
Pick out the wrong statement.
Minimum number of degree of freedom of a system is zero.
Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4.
For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4.
Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
4 comments Page 1 of 1.
Pawan Kumar Sharma said:   2 years ago
Since, during phase change, we provide latent heat (enthalpy) for breaking the intermolecular forces obviously the enthalpy changes and also since there will be a difference in potential energy between two different phases the internal energy also changes.
(1)
Flower said:   3 years ago
I think Gibbs free energy remains unchanged during phase change.
Giffi said:   8 years ago
No, It is not c.

because f=c-p+2,
f = 4-2+2,
f = 2+2,
f = 4.
Surjeet singh said:   9 years ago
I think the answer should be option (c). Because degree of freedom will be,
f = 4 - 2 + 2 - 1 - 1 = 6.
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