Chemical Engineering Thermodynamics - Study Mode
[#421] The third law of thermodynamics states that the
Correct Answer
(A) Heat capacity of a crystalline solid is zero at absolute zero temperature
Explanation
Solution: The third law of thermodynamics states that for all crystalline substances at absolute zero temperature the entropy is zero.
[#422] C p of a gas at its critical temperature and pressure
Correct Answer
(B) Becomes infinity
Explanation
Solution: $${C_p}$$ of a gas at critical point behaves like a substance with infinite thermal capacity that means the temperature of the substance doesn’t change even though heat (Thermal energy) is provided.
[#423] Heat of reaction at constant volume is identified with __________ change.
Correct Answer
(B) Internal energy
Explanation
Solution: By first law of thermodynamics at constant volume the heat of reaction is equal to internal energy and for constant pressure process the heat of reaction is enthalpy.
[#424] Change of state namely evaportation condensation, freezing and melting is an __________ process.
Correct Answer
(A) Isothermal
Explanation
Solution: Change of phase takes place usually at constant temperature as the given heat is used to break the intermolecular forces between the molecules but not to raise the thermal energy.
[#425] The most important application of distribution law is in
Correct Answer
(B) Liquid extraction
Explanation
Solution: Distribution law is greatly used during extraction as there the distribution of species takes place.