A .2kg mass of argon gas fills a .05m^3 piston-cylinder volume at a pressure of 400 kPa absolute. The piston induced pressure is changed until the volume expands to twice its original value, while the temperature remains constant.
A) Does the argon change phase?( I think it has to do with looking up values?)
B) How many protons are in the cylinder?
C)What is the final pressure in the device?