A system at constant pressure undergoes the following three processes at 25 oC.

I. 5 kJ of heat is released into the surroundings

II. 10 kJ of work is done on the surroundings

III. 15 kJ of heat is absorbed by the system

Q4. Please draw a picture to depict the flow of energy into and out of the system as described in the question. Be sure to label the system and surroundings.

Q5. What is the total change in internal energy for the system after it undergoes all three processes? Show work to support your answer.

Q6. Is the overall enthalpy change exothermic, endothermic, or neither? How can you tell?

Q7. Propose a fourth process (like I-III listed above) that would lead to an overall loss of internal energy for the system. For your proposed process, indicate the sign and magnitude of energy that is transferred as well as whether energy flows as heat or work. What would the total change in internal energy be after all four processes take place?

Q8. Later in the semester we'll see that the average kinetic energy of molecules in a system is proportional to temperature. The temperature of this system is held