(Tthtu-
O’L
3d’fK)
ëaJculate the change In enthalpy (hiki) for these reactions.
(t
1
(
4
(
g)+
g
C0
+
l(g2
)+2O
HZ0
-
Astudntmlxed5O.O mL of atercontalnlng
O.025 zuol
at 22.S’C with 50.0 niL of water containing 0.025
mol
OHat22.5’CInapLasdc-cup calorlmet
er.The temperature
tbe resulting solution Increased to 26.0
C. What Is the heat
-
ge(kD In this reaction?
Calculate the change In entropy forth
ese reactions.
a. DaO(s—4 CaO( + CO
(
2
6. 2H
( + O—+ 2H
2
0U).
2
c. 1
H
(
—,aH
+Qc
cI
Ø
d. CH
( + O—+ CO
4
Cg +H
2
O(
2
j
When gaseous nitrogen and hydrog
en are converted to.
gaseous ammonia, G° equals —15.6
4 kUmoL
+
3H —4 ZNH,(g)
Using the 5° values of Table 182.
formation of ammoniL
7’
Determhdng Reaction Spontariefty
drflandS determine whetherthe reaction
are sporita.
neous. Assume all substances are at z5C and 101.3 kPa.
a. 2Na(s) +1—4 2Naa(4
6. 4Al(4 ÷3Ot—’ 2
2A)
U
3
0
1
In
calculate the I4 for the
=
1Tn7rc1m
Substance
AG°f (ki/mol)
Substance
tG°f (ki/mol)
Substance
3 (s)
O
2
A1
-1576.4
Fe (s)
0.0
NO (g)
86.69
2 (g)
Br
3.14
3 (s)
0
2
Fe
-741.0
2 (g)
NO
51.84
Substance
f (ki/mol)
0
IH
2 (I)
Br
0.0
2 (g)
H
0.0
CO (s)
2
Na
3
-1048
3 (s)
0
2
A1
-1676.0
C (s, diamond)
2.866
O (g)
2
H
-228.6
NaCI (s)
-384.03
2 (g)
Br
30.91
C (s, graphite)
0.0
O (I)
2
H
-237.2
02 (g)
0.0
2 (I)
Br
0.0
4 (g)
CH
-50.79
O (I)
2
H
-114.0
03 (g)
163.4
C (s, diamond)
1.9
CO (g)
-137,3
HCI (g)
-95.27
p (s, white)
0.0
C (s, graphite)
0.0
5 (g)
2
H
-33.02
p (s, red)
-14
4 (g)
CH
-74.86
19.4
5 (s, rhombic)
0.0
CO (g)
-110.5
2 (g)
CO
-394.4
3 (s)
CaCO
-1127.7
CaO (s)
-604.2
2 (g)
Cl
0.0
2 (g)
F
0.0
3 (g)
NH
1T
Substance
2
(g)
2
(s)
0.0
5 (s, monoclinic)
0.096
2 (g)
CO
-393.5
2 (g)
N
0,0
2 (g)
SO
-300.4
3 (s)
CaCO
-1207.0
-16.64
3 (g)
SO
-370.4
CaO (s)
-635.1
2 (g)
Cl
0.0
I1UliT F1WT1iJL1
i\S°f (J/mol’
LG°f (ki/mol)
Substance
S°f (J/molk
2 (g)
F
0.0
Fe (s)
0.0
3 (s)
O
2
Fe
-822.1
3 (s)
O
2
A1
50.99
HCI (g)
186.7
(g)
2
H
0.0
2 (g)
Br
245.3
S (g)
2
H
205.6
O (g)
2
H
-241.8
-285.8
2 (I)
Br
152.3
2
(g)
260.6
O (I)
2
H
C (s, diamond)
2,439
2
(s)
117
0 (I)
2
H
-187.8
C (s, graphite)
5.694
2 (g)
N
191.5
HCI (g)
-92.31
4 (g)
CH
186.2
3 (g)
NH
192.5
S (g)
2
H
-20,1
CO (g)
197.9
NO (g)
210.6
2
(g)
62.4
2 (g)
CO
213.6
2 (g)
NO
240.5
2
(s)
0.0
3 (s)
CaCO
88.7
CO (s)
2
Na
3
136
2 (g)
N
0.0
CaO (s)
39.75
O (s)
2
Na
73
3 (g)
NH
-46.19
2 (g)
Cl
223,0
NaCl (s)
72.4
NO (g)
90.37
2 (g)
F
203
02 (g)
205.0
2 (g)
NO
33.85
-1131.1
Fe (s)
27.2
03 (g)
238
CO (s)
2
Na
3
3 (s)
0
2
Fe
90.0
p (s, white)
44.4
O (s)
2
Na
-416
2 (g)
H
130.6
p (s, red)
29
NaCI (s)
-411.2
0 (g)
2
H
188.7
5 (s, rhombic)
31.9
02 (g)
0,0
O (I)
2
H
69.94
5 (s, monoclinic)
32.6
03 (g)
142.0
O (I)
2
H
92
2 (g)
SO
248.5
P (s, white)
0.0
3 (g)
SO
256.2
P (s, red)
-18.4
S (s, rhombic)
0.0
S (s, monoclinic)
0.30
(g)
-296.8
503 (g)
-395.7
502