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22. The First Law of Thermodynamics

Cyclic Thermodynamic Processes

22. The First Law of Thermodynamics

Cyclic Thermodynamic Processes

Multiple Choice
An ideal gas is taken through the four processes shown below. The changes in internal energy for three of these processes are as follows: ΔE_AB = +82 J; ΔE_BC = +15 J; ΔE_DA = –56 J. Find the change in internal energy for the process from C to D.
Open Question
0.25 mol of a gas are compressed at a constant pressure of 250 kPa from 6000 cm^3 to 2000 cm^3, then expanded at a constant temperature back to 6000 cm^3. What is the net work done on the gas?
Open Question
A heat engine using a diatomic gas follows the cycle shown in FIGURE P21.55. Its temperature at point 1 is 20℃.a. Determine Wₛ, Q, and ∆Eₜₕ for each of the three processes in this cycle. Display your results in a table.