The entropy change of the universe is

Question

One kilomole of an ideal gas is throttled from an initial pressure of 0.5 MPa to 0.1 MPa. The initial temperature is 300 K. The entropy change of the universe is                                                                                          

      (a) 13.38 kj/K                                                     (b) 4.14.3 kj/K

      (c) 0.0446 kj/K                                                   (d) –0.0446 kj/K