(3) ( 33.3% Not too bad) Two moles of helium, which you can model as an ideal gas with CV=(3/2)R, is confined in a rigid vessel (constant volume) that is sealed and has no interior moving parts. Initially, the gas has P=1 atm and T=300K. If 1000 Joules of heat are added to the vessel. a) Determine the final temperature of the helium. b) Determine the change in entropy of the helium. (This requires the answer to part a)