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Chem 3433 – Problem Set 3
Due before class on 9/14/11
1.
A perfect gas undergoes an expansion process at constant pressure.
Does its internal
energy increase, decrease or remain the same?
Why?
2.
Four (4.00) moles of a perfect gas at 300.0 K and 1.00 bar pressure undergo a
reversible isothermal compression until the pressure becomes 4.00 bar.
Calculate: q, w,
U and
H.
3.
The virial equation of Ar at 273 K has B = 21.7 cm
3
/mol and C = 1200 cm
6
/mol
2
.
Assume the rest of the coefficients are zero.
Calculate (a) work of isotherm expansion
against a constant pressure of 1 atm, and (b) the work of reversible, isotherm expansion
on the assumption that Ar behaves perfectly.
For this problem V
i
= 500 cm
3
, V
f
= 1000
cm
3
and n=1 mol.
4.
Three moles of a perfect gas at 200.0 K and 2.00 bar pressure undergo a reversible
adiabatic compression until the temperature becomes 250 K.
For the gas, C
v
per mol is
27.5 J/(K mol) over this temperature range.
Calculate: q, w, V
f
, P
f
(in bars),
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 Fall '11
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