Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 6
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148.
Somewhat
C onfusing
D efinitions:
There
a re
s everal
t erms
u sed
i n
t his
c hapter
t hat
s ound
v ery
s imilar.
U se
t he
d ata
p rovided
t o
calculate
e ach
o f
t hem
t o
c larify
t he
d ifferences.
I ’ve
a dded
s ome
“ Notes”
t hat
I
h ope
w ill
h elp.
74.8
J
o f
h eat
i s
r equired
t o
r aise
t he
t emperature
o f
1 8.69
g
o f
s ilver
f rom
1 0.0 ° C
t o
2 7.0 ° C.
a.
What
i s
t he
h eat
c apacity
o f
t he
s ilver
s ample?
( J/°C)
Note:
T his
i s
a
u seful
v alue
o nly
f or
t his
s pecific
s ample
o f
s ilver.
4.4
J /˚C
b.
What
i s
t he
s pecific
h eat
c apacity
o f
s ilver?
( J/g·°C)
Note:
T his
i s
a
u seful
v alue
f or
a ny
s ample
o f
s ilver
t hat
i s
h eated
o r
c ooled.
T his
i s
e quivalent
t o
the
4 .184
J ·g
·°C
t hat
w e
u se
f or
w ater.
T his
v alue
i s
a lso
c alled
t he
s pecific
h eat.
-‐‑ 1
-‐‑ 1
0.235
J /g*˚C
5.6-‐‑ 5 .7:
H ess’s
L aw
a nd
E nthalpies
o f
F ormation
Use
s tandard
e nthalpies
o f
f ormation
( appendix
C )
t o
d etermine
t he
c hange
i n
e nthalpy
f or
e ach
reaction
a)
N aOH(s)
+
H Cl(g)
-‐‑ -‐‑ -‐‑ -‐‑ >
N aCl(s)
+
H
O(g)
2
-‐‑ 1 33.9
k J
b) 2
C O(g)
+
O
(g)
-‐‑ -‐‑ -‐‑ >
2
C O
(g)
2
2
-‐‑ 5 66
k J
c) CH
(g)
+
2
O
(g)
-‐‑ -‐‑ -‐‑ >
C O
(g)
+
2
H
O(l)
4
2
2
2
-‐‑ 8 90.3
k J
d) 2
H
S(g)
+
3
O
(g)
-‐‑ -‐‑ -‐‑ >
2
H
O(l)
+
2
S O
(g)
2
2
2
2
-‐‑ 1 123.6
k J
e)
2
N O(g)
+
O
(g)
-‐‑ -‐‑ -‐‑ >
2
N O
(g)
2
2
-‐‑ 1 13
k J
1.
Using
s tandard
e nthalpies
o f
f ormation,
c alculate
t he
s tandard
e nthalpy
c hange
f or
t he
c ombustion
o f
1
m ol
b enzene,
C
H
(l),
t o
C O
( g)
a nd
H
O
( l).
6
6
2
2
-‐‑ 3 267.4
k J
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