2 moles of an ideal gas (Cv = 5R/2) were subjected to a process in which its state changed from S₁(400 K, 1 atm) to S₂(100 K, 10 atm). The change in molar entropy (in cal mol⁻¹ K⁻¹) is -
(1) -14.4
(2) 5.2
(3) -5.2
(4) 14.4