複選題23. One mole of an ideal gas (Cv = 2R), initially at X, undergoes three reversible steps of a cycle as shown below: Answer the following questions. (ln 3 = 1.1) (A) Find the temperature (T) at state Z. 2% (B) Find the work done (w) for step (3). 2% (C) Find the change in enthalpy (△H) for step (2). 3% (D) Find the heat (q) involved in a cycle. 3%