Exam 1 - Solutions
Professor Gerbrand Ceder
Question 1 (SOLUTION)
I have a machine stirring in a bucket with liquid. The bucket is under constant pressure
and is insulated from the environment (an adiabatic bucket).
a) Which of the foll
(a & b) Sources of irreversibilty
Bucket falling: potential energy is dissipated as heat in the environment at 25 C
mgh = 1 9.8 2 = 19.6J
Dissipated as heat into environment
Exam 1 solutions - Fall 2002
Question 1.) We have 100g of water in a beaker, and it is heated to 100 C by placeing it in contact with a temperature reservoir.
a.) Calculate the entropy change of the beaker of water.
The solution to this problem will depen
dE = T dS
pdV + F dl + dN
E = TS
pV + F l + N
But we are told that we are working under a vacuum so p = 0.
(a) What is the characteristic potential ( )?
Our controlling variables are T, F, N so
Pr o b le m 4 :
The compound is drawn as a line compound for simplicity, though a compound
with off-stoichiometry can also be drawn. Some particular features to look for:
lines a, a, b, b: These represent the two-phase equilibria between