JEE Advanced 2020 Full Test 6 Paper 2

A sample of certain mass of an ideal polyatomic gas is expanded against constant pressure of 1 atm adiabatically from volume 2L, pressure 6 atm and temperature 300K to state where its final volume is 8L. Calculate entropy change (in J\/K) in the process. (Neglect vibrational degrees of freedom) [Take 1L atm =100J,R=8.0J∕mol∕K‌‌log‌2=0.3,log‌3=0.48‌log‌e=2.3]