Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 8
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147.
Iron
o re
c an
b e
c onverted
t o
i ron
m etal
w ith
C O
g as.
FeO
(s)
CO
(g)
Fe
(s)
CO
(g)
+
→
+
2
Calculate
the
standard
enthalpy
change
for this
reaction
from
these
reactions
of
iron
oxides
with
CO
:
(1)
3
Fe
O
(s)
CO
(g)
2
Fe
O
(s)
CO
(g)
H
-
47
kJ
+
→
+
Δ
°
=
2
3
3
4
2
(2)
Fe
O
(s)
3
CO
(g)
2
Fe
(s)
3
CO
(g)
H
-
25
kJ
+
→
+
Δ
°
=
2
3
2
(3)
Fe
O
(s)
CO
(g)
3
FeO
(s)
CO
(g)
H
19
kJ
+
→
+
Δ
°
=
3
4
2
-‐‑ 1 1
k J
8.
Calculate
Δ H
f or
t he
r eaction
C 2H4
( g)
+
H 2
( g)
→
C 2H6
( g),
f rom
t he
f ollowing
d ata.
C2H4
( g)
+
3
O 2
( g)
→
2
C O2
( g)
+
2
H 2O
( l)
ΔH
=
-‐‑ 1 411.
k J/mole
C2H6
( g)
+
7 /2
O 2
( g)
→
2
C O2
( g)
+
3
H 2O
( l)
ΔH
=
-‐‑ 1 560.
k J/mole
H2
( g)
+
½
O 2
( g)
→
H 2O
( l)
ΔH
=
-‐‑ 2 85.8
k J/mole
-‐‑ 1 36.8
k J
9.
Calculate
Δ H
f or
t he
r eaction
4
N H3
( g)
+
5
O 2
( g)
→
4
N O
( g)
+
6
H 2O
( g),
f rom
t he
f ollowing
d ata.
N2
( g)
+
O 2
( g)
→
2
N O
( g)
ΔH
=
-‐‑ 1 80.5
k J
N2
( g)
+
3
H 2
( g)
→
2
N H3
( g)
ΔH
=
-‐‑ 9 1.8
k J
2
H 2
( g)
+
O 2
( g)
→
2
H 2O
( g)
ΔH
=
-‐‑ 4 83.6
k J
-‐‑ 1 628.2
k J
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