question_answer

One mole of \[C{{O}_{2}}\] at 300 K and 1 atm pressure is heated in a closed vessel so that temperature is 500 K and pressure is 5 atm. Then it is cooled so that temperature is 300 K and pressure is 1 atm. What is the change in internal energy of the gas?

Answer:

                No change because internal energy is a state function and the system has returned to original state.