If the heat capacity varies with temperature, a better form of equation 2.9 is to solve q = ∫ T i T f n C T - ⅆ t A 50.0-g sample of white phosphorus is heated from 298 K to 350K. If its molar heat capacity is C T - = 56.99+0.1202T J/mol.K, how much heat is needed?
If the heat capacity varies with temperature, a better form of equation 2.9 is to solve q = ∫ T i T f n C T - ⅆ t A 50.0-g sample of white phosphorus is heated from 298 K to 350K. If its molar heat capacity is C T - = 56.99+0.1202T J/mol.K, how much heat is needed?
Solution Summary: The author explains that the heat needed is 8.03 x 10 3 J. The specific heat is an intensive property and is a proportionality constant.
If the heat capacity varies with temperature, a better form of equation 2.9 is to solve
q
=
∫
T
i
T
f
n
C
T
-
ⅆ
t
A 50.0-g sample of white phosphorus is heated from 298 K to 350K. If its molar heat capacity is
C
T
-
= 56.99+0.1202T J/mol.K, how much heat is needed?
(c) The following data have been obtained for the hydrolysis of sucrose, C12H22O11, to
glucose, C6H12O6, and fructose C6H12O6, in acidic solution:
C12H22O11 + H2O → C6H12O6 + C6H12O6
[sucrose]/mol dm³
t/min
0
0.316
14
0.300
39
0.274
60
0.256
80
0.238
110
0.211
(i) Graphically prove the order of the reaction and determine the rate constant of the
reaction.
(ii) Determine the half-life, t½ for the hydrolysis of sucrose.
(III) adsorbent
(b) Adsorption of the hexacyanoferrate (III) ion, [Fe(CN)6] ³, on y-Al2O3 from aqueous
solution was examined. The adsorption was modelled using a modified Langmuir
isotherm, yielding the following values of Kat pH = 6.5:
(ii)
T/K
10-10 K
280
2.505
295
1.819
310
1.364
325
1.050
Determine the enthalpy of adsorption, AadsHⓇ.
If the reported value of entropy of adsorption, Aads Se = 146 J K-1 mol-1 under the above
conditions, determine Aads Gº.
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