A2L Item 195

Goal: Reasoning with thermodynamics

Source: ctqpe214

system consisting of a quantity of ideal gas has the two isotherms
shown. The system, initially at state C, can be taken along path CA to
final state A or along path CB to state B.

Which of the following is true:

  1. QCA < QCB
  2. QCA = QCB
  3. QCA > QCB
  4. Not enough information



(1) Since the internal energy of an ideal gas depends only on
temperature, states A and B have the same internal energy. Along path CB
the system does work requiring more heat to be added than along path CA.