Part of retina insensitive to light

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

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

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value