CHAPTER 11 REACTIONS AND OTHER CHEMICAL PROCESSES
PROBLEMS 361
Table 11.3 Data for Problem 11. 7. The values of intensive properties are
for a temperature of298:15K and a pressure of 30 bar unless otherwise
stated. Subscripts: A = H 2 O, B = O 2 , C = CO 2.
Properties of the bomb vessel:
internal volume....................... 350:0cm^3
mass ofn-hexane placed in bomb....... 0:6741g
mass of water placed in bomb.......... 1:0016g
Properties of liquidn-hexane:
molar mass........................... MD86:177g mol ^1
density............................... D0:6548g cm ^3
cubic expansion coefficient............. D1:378 10 ^3 K ^1
Properties of liquid H 2 O:
molar mass........................... MD18:0153g mol ^1
density............................... D0:9970g cm ^3
cubic expansion coefficient............. D2:59 10 ^4 K ^1
standard molar energy of vaporization.. .ÅvapUD41:53kJ mol ^1
Second virial coefficients,298:15K:
BAA................................. 1158 cm^3 mol ^1
BBB................................. . 16 cm^3 mol ^1
dBBB=dT............................ 0:21cm^3 K ^1 mol ^1
BCC................................. . 127 cm^3 mol ^1
dBCC=dT............................ 0:97cm^3 K ^1 mol ^1
BAB................................. 40 cm^3 mol ^1
BAC................................. . 214 cm^3 mol ^1
BBC................................. . 43:7cm^3 mol ^1
dBBC=dT............................ 0:4cm^3 K ^1 mol ^1
Henry’s law constants at 1 bar (solvent = H 2 O):
O 2.................................. .km;BD 796 bar kg mol ^1
CO 2................................. km;CD29:7bar kg mol ^1
Partial molar volumes of solutes in water:
O 2.................................. .VB^1 D 31 cm^3 mol ^1
CO 2................................. VC^1 D 33 cm^3 mol ^1
Standard molar energies of solution (solvent = H 2 O):
O 2.................................. .ÅsolUD 9:7kJ mol ^1
CO 2................................. ÅsolUD 17:3kJ mol ^1
11.7 This 16-part problem illustrates the use of experimental data from bomb calorimetry and other
sources, combined with thermodynamic relations derived in this and earlier chapters, to eval-
uate the standard molar combustion enthalpy of a liquid hydrocarbon. The substance under
investigation isn-hexane, and the combustion reaction in the bomb vessel is
C 6 H 14 .l/C^192 O 2 .g/!6 CO 2 .g/C7 H 2 O.l/
Assume that the sample is placed in a glass ampoule that shatters at ignition. Data needed for
this problem are collected in Table11.3.
States 1 and 2 referred to in this problem are the initial and final states of the isothermal bomb
process. The temperature is the reference temperature of298:15K.