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SVNAS 8th Edition Annotated Solutions Chapter 1

Updated 16/01/2017 p. 1 of 19

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2

3

energy J N m kg mpower = = = =

time s s s

chargecurrent =

time

charge = current*time = A s

energypower = = current*electric potential

time2

3

energy kg melectrical potential = =

current*time A s

electrical potentialcurrent =

resistance2

2 3

electrical potential kg mresistance = =

current A s

Solution Manual for Introduction to Chemical Engineering Thermodynamics 8th Edition by Smith

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Updated 16/01/2017 p. 2 of 19



chargeelectrical potential =

electrical capacitance2 4

2 2

3

charge A s A selectrical capacitance =

kg melectrical potential kg m

A s

/ C/ torr 10 7.5 / kPa=7.5exp/ K

ba

Sat Satt c BP P A

T C

exp 2.303 =7.5exp/ K - 273.15 / K

b Ba A

T c T C

2.303 =ln 7.5 +/ K - 273.15 / K

b Ba A

T c T C







Updated 16/01/2017 p. 3 of 19



The point of this problem is just for you to practice evaluating and plotting a simple function.

You will do a number of problems over the course of the semester (and many more over the

course of your career) in which the results are best presented in graphical form. The only thing to

be careful of in plotting the Antoine equation is to pay attention to the units of T and Psat and to

whether the constants are given for use with the base 10 logarithm or the natural logarithm. The

parameters in Table B.2 are for use with T in °C, P in kPa, and the natural logarithm.

I used MS Excel to prepare the plots for diethyl ether. A portion of the spreadsheet (containing

the plots) is shown below:

A 13.9891 B 2463.93 C 223.24

T (deg C) Psat (kPa)

-30 3.450361508

-29 3.684455127

-28 3.931786307

-27 4.192943086

-26 4.468531566

-25 4.759176154

-24 5.065519787

-23 5.388224158

-22 5.727969934

-21 6.085456959

-20 6.461404464

-19 6.856551255

-18 7.271655907

-17 7.707496937

-16 8.16487298

-15 8.644602953

-14 9.147526209

-13 9.674502686

-12 10.22641305

-11 10.80415881

-10 11.40866246

-9 12.0408676

-8 12.70173902

-7 13.39226279

-6 14.11344639

-5 14.86631874

-4 15.65193033

-3 16.4713532

-2 17.3256811

-1 18.21602942

0 19.14353533

1 20.10935774

0

20

40

60

80

100

120

140

160

180

200

-30 -20 -10 0 10 20 30 40 50 60

Vap

or

Pre

ssu

re (

kPa)

Temperature (°C)

Vapor pressure of Diethyl Ether

1

10

100

-30 -10 10 30 50

Vap

or

Pre

ssu

re (

kPa)

Temperature (°C)

Vapor pressure of Diethyl Ether







Updated 16/01/2017 p. 4 of 19



-500

-400

-300

-200

-100

0

100

200

300

0 50 100 150 200 250 300 350

T (

deg

C o

r d

eg

F)

T (K)

SVNAS, problem 1.4

deg C

deg F







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dP Pg

dz RT

M

dP gdz

P RT

M

ln o

o

P gz z

P RT

M

expo o

gP P z z

RT

M

0.029*9.8

101325exp 1609 83430 Pa8.314*283

P







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3 3 1 11.25 kg m *55880 m s = 69850 kg sm q







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A B C

12.74 2017.87 -80.87

T (°C) T(K) Psat

(kPa) ln (Psat

) ln (Psat)fit Error2

Psatfit (kPa) Relative Error

-18.5 254.65 3.18 1.157 1.125 1.02E-03 3.08 -3.2%

-9.5 263.65 5.48 1.701 1.697 2.03E-05 5.46 -0.4%

0.2 273.35 9.45 2.246 2.253 4.77E-05 9.52 0.7%

11.8 284.95 16.9 2.827 2.849 4.61E-04 17.27 2.2%

23.1 296.25 28.2 3.339 3.368 7.96E-04 29.01 2.9%

32.7 305.85 41.9 3.735 3.767 1.02E-03 43.26 3.3%

44.4 317.55 66.6 4.199 4.211 1.43E-04 67.40 1.2%

52.1 325.25 89.5 4.494 4.479 2.24E-04 88.17 -1.5%

63.3 336.45 129 4.860 4.841 3.50E-04 126.61 -1.9%

75.5 348.65 187 5.231 5.201 9.19E-04 181.42 -3.0%

Error Sum 5.01E-03

0.000

1.000

2.000

3.000

4.000

5.000

6.000

200 250 300 350 400

ln(P

ress

ure

(kP

a))

Temperature (K)

0

20

40

60

80

100

120

140

160

180

200

-50 0 50 100

Pre

ssu

re(k

Pa)

Temperature (°C)

ln / kPa/ K

sat BP A

T C







Updated 16/01/2017 p. 19 of 19








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