Please answer question 1,2and 3 in the attached file for me.

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

Ways that industry and agriculture use physical properties to separate substances

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)