SMC/Physics 23/Fall 2023/Faridian/Exam 3 9) A heat engine takes 2.0 moles of an ideal gas through the reversible cycle abca, on the pV diagram shown in the figure. The path be is an isothermal process. The temperature at c is 820 K, and the volumes at a and care 0.010 m3 and 0.16 m3, respectively, The molar heat capacity at constant volume, of the gas, is 37 ]/mol.K, and the ideal gas constant is R - 8.314 )/(mol.K). The thermal efficiency of the engine is closest to 820 K 0.010 m 0.16 m3 A) 0.26. B) 0.026. C) 0.33. D) 0.40. E) 0.53. 10) An ideal gas with y = 1.67 is initially at 0 C in a volume of 10.0 L at a pressure of 1.00 atm. It is then expanded adiabatically to a volume of 10.4 L. What is the final temperature of the gas? A) -7.1 C B) 2.5 .C C)-23" C D) 68.C 1) :20 C