Enthalpy of Formation
AP Chemistry · Flashcards · Application
AP CHEMISTRY · FLASHCARDS
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QUESTION
Which substance has an enthalpy of formation of 0:
N
2
(
g
)
N_2(g)
N
2
(
g
)
,
N
2
O
(
g
)
N_2O(g)
N
2
O
(
g
)
, or
N
H
3
(
g
)
NH_3(g)
N
H
3
(
g
)
?
QUESTION
Calculate the enthalpy change for
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
N_2(g) + 3H_2(g) \rightarrow 2NH_3(g)
N
2
(
g
)
+
3
H
2
(
g
)
→
2
N
H
3
(
g
)
given
ΔH
f
°
(
N
H
3
(
g
)
)
=
−
45.9
\text{ΔH}_f^\text{°}(NH_3(g)) = -45.9
ΔH
f
°
(
N
H
3
(
g
))
=
−
45.9
kJ/mol.
QUESTION
Calculate the standard enthalpy change for
C
(
s
)
+
O
2
(
g
)
→
C
O
2
(
g
)
C(s) + O_2(g) \rightarrow CO_2(g)
C
(
s
)
+
O
2
(
g
)
→
C
O
2
(
g
)
given
ΔH
f
°
(
C
O
2
(
g
)
)
=
−
393.5
\text{ΔH}_f^\text{°}(CO_2(g)) = -393.5
ΔH
f
°
(
C
O
2
(
g
))
=
−
393.5
kJ/mol.
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ANSWER
-393.5 kJ/mol. Formation reaction equals the formation enthalpy directly.
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