Multicomponent Equilibrium Thermodynamics - Elements of Environmental Engineering: Thermodynamics and Kinetics - page 113

vapor pressure of p , p -DDT at different temperatures are given below:

t ( ◦ C) P i

(Torr)

2.58 × 10 − 6

25

2.25 × 10 − 3

90

5.18 × 10 − 3 100

110 0.0114

120 0.0243

130 0.0497

140 0.0984

150 0.189

The melting point of DDT is 109 ◦ C. (A) Obtain from the above data the
enthalpy of vaporization of DDT. (B) Estimate the vapor pressure of solid
DDT at 25 ◦ C.
3.50 3 An aqueous solution containing 2.9 × 10 − 4 mole fraction of CO 2 is
in equilibrium with pure CO 2 vapor at 101.325 kPa total pressure and
333 K. Calculate the mole fraction of CO 2 in water if the total pressure is
10132.5 kPa at 333 K. Neglect the effect of pressure on Henry's constant.
Also assume that the vapor phase behaves ideally, whereas the aqueous
phase does not.
3.51 2 Given the following data on the aqueous solubility of SO 2 at 298 K,
calculate Henry's constant in various forms:

x i

P i (atm)

3.3 × 10 − 4 0.0066

10 − 4 5.7 × 0.013

2.3 × 10 − 3

0.065

10 − 3

4.2 × 0.131

7.4 × 10 − 3

0.263

10 − 2 1.0 × 0.395

3.52 3 Oil field waste, considered nonhazardous, is transported in a tanker truck
of volume 16 m 3 and disposed in landfarms. The total waste is composed
of 8 m 3 of water over 1 m 3 of waste oil. The waste oil is sour and there
is the possibility of hydrogen sulfide generation. Use the fugacity level I
model to determine the percent hydrogen sulfide in the vapor phase inside
the truck. Hydrogen sulfide properties: K H = 560 atm, waste oil-water
partition constant = 10, waste density = 1.1 g/cm 3 .
3.53 3 Freshwater lakes receive water from the oceans through evaporation by
sunlight. Consider the ocean to be made entirely of NaCl of 0.4 M in ionic
strength and the lake to be 0.001 M in MgCl 2 . Compute the free energy
required to transfer 1 mol of pure water from ocean to lake. Assume a
constant temperature of 298 K.
3.54 2 The Henry's constant for phenanthrene at 20 ◦ C was measured as
2.9 Pa m 3 /mol and its enthalpy of volatilization was determined to be
41 kJ/mol. What is the Henry's constant at 25 ◦ C? The melting point of
phenanthrene is 100.5 ◦ C.