The first one on gets brainilest

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

Atomic nuclei of almost all elements consist of