Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 7
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
142.
Using
s tandard
e nthalpies
o f
f ormation,
c alculate
t he
e nthalpy
c hange
f or
t he
c ombustion
o f
1
m ol
o f
ethanol:
C
H
OH
( l)
+
3 O
( g)
→
2 CO
( g)
+
3 H
O
( l)
2
5
2
2
2
-‐‑ 1 366.7
k J
3.
The
s tandard
e nthalpy
c hange
f or
t he
r eaction
C aCO
(s)
→
C aO(s)
+
C O
(g)
i s
1 78.1
k J.
F rom
t he
3
2
values
f or
t he
s tandard
e nthalpy
o f
f ormation
o f
C aO(s)
a nd
C O
(g),
c alculate
t he
s tandard
e nthalpy
o f
2
formation
o f
C aCO
(s).
3
-‐‑ 1 207.1
k J
4.
Given
t he
f ollowing
s tandard
e nthalpy
o f
r eaction,
u se
t he
s tandard
e nthalpies
o f
f ormation
t o
calculate
t he
s tandard
e nthalpy
o f
f ormation
o f
C uO(s):
CuO(s)
+
H
(g)
→
C u(s)
+
H
O(l)
Δ H°
=
-‐‑ 1 29.7
k J
2
2
-‐‑ 1 56.1
k J
5.
Using
H ess’s
L aw,
c alculate
t he
s tandard
e nthalpy
o f
f ormation
o f
g aseous
d iborane
( B
H
)
u sing
t he
2
6
following
t hermochemical
i nformation:
4B(s)
+
3 O
(g)
→
2 B
O
(s)
ΔH
=
-‐‑ 2 509.1
k J
2
2
3
2H
(g)
+
O
(g)
→
2 H
O(l)
ΔH
=
-‐‑ 5 71.7
k J
2
2
2
B
H
(g)
+
3 O
(g)
→
B
O
(s)
+
3 H
O(l)
ΔH
=
-‐‑ 2 147.5
k J
2
6
2
2
3
2
35.4
k J
6.
Naphthalene
( C
H
)
i s
a
s olid
a romatic
c ompound
o ften
s old
a s
m othballs.
T he
c omplete
10
8
combustion
o f
t his
s ubstance
t o
y ield
C O
(g)
a nd
H
O(l)
a t
2 5°
C
y ields
5 154
k J/mol.
2
2
a)
W rite
b alanced
e quations
f or
t he
f ormation
o f
n aphthalene
f rom
t he
e lements
a nd
f or
i ts
c ombustion.
b)
C alculate
t he
s tandard
e nthalpy
o f
f ormation
o f
n aphthalene.
C
H
( s)
+
1 2O
( g)
→
1 0CO
( g)
+
4 H
O
( l)
10
8
2
2
2
72.8
k J
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education