4.08 – Applications of Free Energy and Work

We've completed our thermodynamics topics and now it's time for a little bit more practice connecting work to free energy.

Lesson Objectives

  • Review thermodynamics concepts to prepare for the exam

Copy down 10 problems from the site above and work them out on a separate sheet of paper.  You can use the website to check your answers.  Paste an image of your final results when you have correctly completed 10 problems.

Now that you have a handle on this material, work through these mastery problems.  You can check your answers on OneNote.  Make sure to post your stamped work on OneNote after you are finished.


(a) How much heat is produced in burning 1 mol of ethane (C2H6) under standard conditions if reactants and products are brought to 298 K and H2O(l) is formed?

(b) What is the maximum amount of useful work that can be accomplished under standard conditions by this system?

 19.107             The reaction below is the basis of a suggested method for removal of SO2 from power-plant stack gases. The standard free energy of each substance is given in Appendix C.

SO2(g) + 2 H2S(g) ⇌ 3 S(s) + 2 H2O(g)

(a) What is the equilibrium constant for the reaction at 298 K?

(b) In principle, is this reaction a feasible method of removing SO2?

(c) If PSO2 = PH2S and the vapor pressure of water is 25 torr, calculate the equilibrium SO2 pressure in the system at 298 K.

(d) Would you expect the process to be more or less effective at higher temperatures?

2009 FRQ #5


You worked that out pretty well didn't you?