Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 12
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1414.
Calculate
t he
e nthalpy
o f
r eaction
f or
D
+
F
→
G
+
M
u sing
t he
f ollowing
e quations
a nd
d ata:
G
+
C
→
A
+
B
ΔH°
=
+ 277
k J
C
+
F
→
A
ΔH°
=
+ 303
k J
D
→
B
+
M
ΔH°
=
-‐‑ 1 58
k J
a)
-‐‑ 1 32
k J
c)
+422
k J
b)
-‐‑ 4 22
k J
d)
+132
k J
15.
Calculate
t he
s tandard
e nthalpy
o f
t he
r eaction
f or
t he
p rocess
3 NO(g)
→
N
O(g)
+
N O
(g)
u sing
t he
2
2
standard
e nthalpies
o f
f ormation
( in
k J/mol):
N O
=
9 0;
N
O
=
8 2.1;
N O
=
3 4.0
2
2
a)
-‐‑ 1 53.9
k J
c)
-‐‑ 2 6.1
k J
b)
2 06
k J
d)
386
k J
16.
The
s tandard
m olar
e nthalpy
o f
c ombustion
i s
-‐‑ 1 277.3
k J
f or
t he
c ombustion
o f
e thanol.
C
H
OH(l)
+
3 O
(g)
→
2 CO
(g)
+
3 H
O(g)
2
5
2
2
2
Calculate
t he
s tandard
m olar
e nthalpy
o f
f ormation
f or
e thanol
b ased
o n
t he
f ollowing
s tandard
enthalpies
o f
f ormation:
ΔH°
C O
=
-‐‑ 3 93.5
k J/mol
f
2
ΔH°
H
O
=
-‐‑ 2 41.8
k J/mol
f
2
a)
-‐‑ 6 42.7
k J/mol
c)
235.1
k J/mol
b)
-‐‑ 2 35.1
k J/mol
d)
642.7
k J/mol
17.
Calculate
t he
a mount
o f
h eat
n eeded
t o
c hange
2 5.0
g
i ce
a t
0 °C
t o
w ater
a t
0 °C.
The
h eat
o f
f usion
o f
H
O
=
3 33
J /g;
2
a)
56.5
k J
c)
7.06
k J
b)
8 .33
k J
d)
463
k J
1.
If
t he
t emperature
o f
a
5 0.0-‐‑ g ram
b lock
o f
a luminum
i ncreases
b y
1 0.9
K
w hen
h eated
b y
5 00
Joules,
c alculate
t he
a.
heat
c apacity
o f
t he
a luminum
b lock
4 5.9
J /K
b.
specific
h eat
o f
a luminum
0 .917
J /g*K
2.
Calculate
t he
h eat
n ecessary
t o
c hange
t he
t emperature
o f
o ne
k g
o f
i ron
f rom
2 5°C
t o
1 000°C.
The
s pecific
h eat
o f
i ron
i s
0 .451
J K
g
.
-‐‑ 1
-‐‑ 1
440
k J
3.
If
a
4 0
g ram
b lock
o f
c opper
a t
1 00°C
i s
a dded
t o
1 00
g rams
o f
w ater
a t
2 5°C,
c alculate
t he
f inal
temperature
a ssuming
n o
h eat
i s
l ost
t o
t he
s urroundings.
T he
s pecific
h eat
o f
c opper
i s
0 .385
J K
-‐‑
g
a nd
t he
s pecific
h eat
o f
w ater
i s
4 .184
J K
g
.
1
-‐‑ 1
-‐‑ 1
-‐‑ 1
27.7˚C
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