Changing the state of a gas A sample of nitrogen of mass 1 g is contained in a 1000 cm volume at an initial temperature of 288.15 K. Take the nitrogen to be a perfect gas, with a molar mass of 14.01 x 10-3kg/mol and a constant specific heat ratio of 1.40. (a) Compute the density (kg/m) and pressure (kPa) of the gas at the initial state (b) Calculate the changes in pressure (kPa) and internal energy (J), when the sys- I tem undergoes a process that produces a final volume of 100 cm and a final temperature of 500 K