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Example 2.1
For a liquid A at 350K and 1 bar, = 50x10-6 bar-1. To what pressure must water be
compressed at 350 K to change its density by 0.5%? Assume that is independent of P.
At T = constant (using expression for )
dP
= dP
P
P
Or : ln 2 = P
P1
Now P 2

Example 4.1
An inventor claims to have devised a cyclic engine which exchanges heat with reservoirs at
27C and 327C, and which produces 0.6 kJ of work for each kJ of heat extracted from the
hot reservoir. Is the claim believable? If instead he claimed tha

Example 8.1
Consider the reaction: C 2 H 4 (g) + H 2 O(g) C 2 H 5 OH(g). If an equimolar mixture of
ethylene and water vapor is fed to a reactor which is maintained at 500 K and 40 bar
determine the degree of conversion, assuming that the reaction mixture

Example 5.1
Derive an expression for enthalpy change of a gas during an isothermal process assuming using
the following EOS: P (V b) =
RT
V
dH= C p dT + V T
dP
T P
P (V-b) = RT
V
R
=
T P P
dH = C p dT + V
=
H
RT
C p dT + bdP
dP =
P
C dT +

Example 6.1
Consider a solution of two species S1/S2 at 25oC such that x 1 = 0.4. If V1 = 40 x 10-6 m3/mol,
find V2 . The solution specific gravity is = 0.90 and the molecular weights of the species are
32 and 18 respectively.
Molar mass of solution = x 1

Example 9.1
Use the van Laar activity coefficient expression to predict the compositions of co-existing
liquid phases (I and II) comprised of two partially miscible liquids (1) and (2) at 50oC and 4
bar. At these conditions the van Laar equations are give

Example 3.1
A gas initially at 1 MPa, 500C is contained in a piston-cylinder arrangement of initial
volume of 0.1 m3. The gas expanded isothermally to a final pressure of 100 kPa. Determine
the work.
PV = Constant; V2 =
=
W
PV
1 1
P2
C
PdV dV
=
V
W = PV
1

Chapter 8 Assignment
(Answers are in parenthesis)
1.
Calculate the standard Gibbs free energy change and the equilibrium constant at
298K for the following reaction: C 2 H 5 OH(g) + (1/2)O 2 (g) CH 3 CHO(g) +
H 2 O(g). [ 188.9kJ; 1.4x1038]
2.
Assuming tha

Chapter 9 Assignment
(Answers are in parenthesis)
1. The liquids, perfluoro-n-heptane and benzene are only partially miscible at
temperatures below their UCST of 113.4oC. At 100oC one liquid phase is
approximately 0.48 mole fraction benzene, and the other