Classify each statement as being true or false?

(a) If you know the pressure, temperature and the number of moles of a gas, you have all the information to exactly reproduce the same state of the gas in a laboratory.





(b) The energy of any gas always remains constant in an isothermal process.





(c) The work done by the system is always maximum in a reversible process.





(d) Entropy of a system increases more in an irreversible process than in a reversible one with the same initial and final states.





(e) In a reversible adiabatic process, the entropy of a system remains constant.Classify each statement as being true or false?
(a) is true





(b) is only true if for an ideal gas, but not, in general, for ';real'; gases. (The internal energy of an ideal gas depends only on temperature.)





(c) is true.





(d) is false. Entropy is a state function, so if the system has the same initial and final states, it's entropy does not change. The entropy of the *universe*, however, increases more for the irreversible process than for the reversible process.





(e) is true, so long as the system is also closed with respect to exchange of matter. In an adiabatic process, no heat (q) is transferred between the system and the surroundings, so dq = 0. One definition of the entropy is dS = dq_rev/T, so if dq = 0, dS = 0