Chemistry Worksheets - Chem 340, Fall 2013 Page 2
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193.8(b) Calculate the standard reaction entropy at 298 K of
2+
2+
(aq)→Zn
(a) Zn(s) + Cu
(aq) + Cu(s)
(g)→12 CO
(b) C
H
O
(s) + 12 O
(g) + 11 H
O(l)
12
22
11
2
2
2
3.13(b) Calculate the change in the entropies of the system and the surroundings, and the total
change in entropy, when the volume of a sample of argon gas of mass 21 g at 298 K and 1.50 bar
3
3
increases from 1.20 dm
to 4.60 dm
in (a) an isothermal reversible expansion, (b) an isothermal
irreversible expansion against p
= 0, and (c) an adiabatic reversible expansion.
ex
3.15(b) A certain heat engine operates between 1000 K and 500 K. (a) What is the maximum
efficiency of the engine? (b) Calculate the maximum work that can be done by for each 1.0 kJ of
heat supplied by the hot source. (c) How much heat is discharged into the cold sink in a reversible
process for each 1.0 kJ supplied by the hot source?
(a) η= 1- T
/T
[eqn 3.10] = 1- 500K/1000K = 0.500
c
h
(b) Maximum work = η|q
| = 0.500 x 1.0 kJ = 0.5 kJ
h
(c) η
=η
and |w
|= |q
| - |q
|
max
rev
max
h
c,min
|= 1.0 kJ – 0.5 kJ = 0.5 kJ
| - |w
|q
| = |q
max
c,min
h
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