thermodynamics

i want 3 only quicly

Time left 0:29:09 A piston-cylinder assembly contains 20 L of an ideal gas at 30 C and 12 bar. The gas reversibly expands to 5 bar. 1. Apply and formulate the first law of thermodynamics for this process. Potential and kinetic energies can be neglected. [10 Points) 2. Calculate the change in internal energy for the above process when it happens isothermally. Also, calculate work done during the process and heat transfer. [5 (internal energy) + 15 (work done) + 5 (heat transfer) = 25 Points) 3. When the process is done adiabatically (instead of isothermally), calculate the change in internal energy and heat transfer. [10 (internal energy) + 5 (work done) = 15 Points) = Note: Explain your answer where required