Question

True or False (Problems 1 through 10) 1. The change in entropy of a closed system is the same for every process between two specified states 2. The entropy of a fixed amount of an incompressible substance increases in every process for which temperature increases 3. A process that violates the second law of thermodynamics violates the first law of thermodynamics. 4. When a net amount of work is done on a closed system undergoing an internally reversible process, a net heat transfer of energy from the system also occurs. 5. One corollary of the second law of thermodynamics states that the change in entropy of a closed system must be greater than or equal to zero. 6.A closed system can experience a decrease in entropy only when there is heat transfer from the system to its surroundings during the process 7. Entropy is produced in every internally reversible process of a closed system. 8. In an adiabatic and internally reversible process of a closed system the entropy remains constant 9. The entropy of a fixed amount of an ideal gas increases in every isothermal process. 10. The specific internal energy and enthalpy of an ideal gas are each functions of temperature alone, but its specific entropy depends on two independent intensive properties. Provide brief response to Problems 11 through 15 11. When applying the entropy balance to a system, which irreversibilities are included in the entropy production term: internal and/or external? 12. For an isolated system, the entropy can only increase. Does it have a maximum? 13. Can the entropy balance for a closed system be used to prove the Clausius and Kelvin-Planck statements of the second law? Explain. 14. A gas is contained in a closed, rigid container fitted with a stirring rod. Energy is transferred to the gas by the stirring rod. Can the entropy of the gas decrease? 15. Can adiabatic mixing of two substances result in decreased entropy? Explain

Answer 1

True. The change in entropy of a closed system is the same for every proces between two specfied states. Entropy is a point function. change in entropy depends only on the properties of the two end states, but not an the process it has followed. Therefore, change in entropy is same for every process between 2 Specified states. AS = S2-S, Scanned with CamScanner