HW8, problem 42

A slight correction to the problem statement:

In part (b), please calculate the entropy change for the world, i.e., that due to both the system and environment entropy change. The point is to show you that supercooled water freezes, the entropy of the world increases and thus this process does not violate the second law, even though "disorder" may seem to be decreasing.

Cheers,
MSS

Some Notes on Homework #6

Problem 28

When calculating the percent error, compare your calculated enthalpy at 25 °C to the tabulated value at 0 °C (1189.5 J/g). Please ignore the fact that this tabulated value is not at the same temperature as your results. You do not need to rescale the tabulated value to 25 °C.

Problem 31-b

For this problem, assume that no phase changes occur - all components remain gases over all temperatures. Also assume that the heat capacity coefficients given in Appendix C.1 are valid over all temperatures. There is a typo in the problem, so don't worry if your answer seems off, just approach the problem the same way you've learned in class.

Monday morning office hours cancelled

I have a conflicting appointment tomorrow and won't be able to keep my office hour Monday morning. If you have questions on the homework, please email me, stop by my office (Eng. II, room 3218), or come to Anthony, Kate, or Prof. Shell's office hours. I apologize for any inconvenience.

Brandon

Review sessions

Dear class,

Just a quick reminder that I will hold review sessions Wed and Thursday evenings from 5:30-6:30pm in Engineering II 1519.

Also, I have extended the deadline for HW5 to Wednesday, Feb 9.

Cheers,
MSS