2. Graphs and Images a. (15 pts.) The following graph shows the Joule-Thomson coefficients for a variety of gases at 1atm. i. Which of the following gases could not be used as a refrigerant at room temperature and pressure? (Circle all that apply) HeH2N2ArCO2 ii. Which gas would be the best refrigerant at 500K ? HeH2N2ArCO2 iii. What is the Joule-Thomson inversion temperature for H2 at this pressure? 50K100K200K400KK iv. At what temperature range do the attractive forces predominate for N2 gas at this pressure? All temps less than 600K400600K greater than 600K At no temperature