Chemistry 218
Name_____________________________ Problem Set #6
This problem set is due by the end of class on Wednesday, April 20
th
. Please begin answering the
questions directly on this sheet and add as many additional sheets as necessary.
Where an explanation
is requested, the majority of the points depend on the explanation. For quantitative problems,
all work must be shown.
1. R-C&O 15.52
2. R-C&O 15.78
3. R-C&O 16.31
4. R-C&O 17.42 Contrary to what the book asks, you are actually supposed to use the data given to
calculate the bond Cl
!
Cl energy in Cl
2+
.
5. R-C&O 17.56
6. R-C&O 18.24
7. Given that the Xe
!
F bond energy is 133 kJ/mol, the F
!
F bond energy is 159 kJ/mol and that the
enthalpy of sublimation of XeF
4
is 62 kJ/mol, estimate
)
H
f
° of XeF
4
(s).
1.
½ N2 (g) + 3 H2O (R) + 3 e! (aq) 6 NH3 (aq) + 3 OH! (aq)
)G° = [1 mol ()G°
f (NH3 (aq))) + 3 mol ()G°
f (OH! (aq))) ]
! [½ mol ()G°
f (N2 (g)) + 3 mol ()G°
f (H2O (R)) + 3 mol ()G°
f (e! (aq)))]
)G° = [1 mol (!26.5 kJ @ mol!1) + 3 mol (!157 kJ @ mol!1)]
! [½ mol (0 kJ @ mol!1) + 3 mol (!237 kJ @ mol!1) + 3 mol (0 kJ @ mol!1)] =
+214 kJ
)G° = !nFE°
