During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?
Correct answer: C. Gibbs free energy
- A. Enthalpy
- B. Internal energy
- C. Gibbs free energy
- D. Entropy
Explanation
At equilibrium during a phase change, the molar Gibbs free energies of the two phases are equal, so the specific Gibbs free energy does not change. Enthalpy and entropy do change because latent heat is absorbed or released.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
Practise Chemical Engineering Thermodynamics
598 free Chemical Engineering Thermodynamics MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Chemical Engineering Thermodynamics questions
At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?
The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?
Cp - Cv for an ideal gas is equal to________________?
The vapor pressure of liquids (having similar chemical nature) at any specified temperature ______________ with increasing molecular weight?
Heat of reaction is a function of the___________________?
Boiling point of a non-homogeneous mixture of immiscible liquids is _____________ that of any one of its separate components?