Butane gas is compressed from an initial state of 0.00687 m/mol, 0.4 MPa and 350K to a final state of 0.001225 m/mol, 2 MPa and 390K. Calculate the change in internal energy of butane using the Van der Waals EOS: P = (R,T/(v- b)) (a/v?) [10 marks] Data: Cy =117 J/mol K; a = 1.3876 Pa m/mol; b= 1.163 x 10* m/mol; Ro 8.314 bars m/mol K