A sample consisting of 1.0 mol of CH4 is initially at 3.25 atm and 310 K. It undergoes reversible adiabatic expansion until its pressure reaches 2.50 atm. Calculate final volume and final temperature after the adiabatic expansion. Assume CH4 as a perfect gas. (Hint: You need to first calculate CV,m and Cp,m of CH4. CH4 is a non-linear molecule.)