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The molar heat of formation of is and those of
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
The molar heat of formation of
NH
4
NO
3
(
s
)
\text{NH}_4\text{NO}_3(s)
NH
4
NO
3
(
s
)
is
−
367.54
kJ
-367.54 \text{ kJ}
−
367.54
kJ
and those of
N
2
O
(
g
)
\text{N}_2\text{O}(g)
N
2
O
(
g
)
,
H
2
O
(
l
)
\text{H}_2\text{O}(l)
H
2
O
(
l
)
are 81.46 and
−
285.8
kJ
-285.8 \text{ kJ}
−
285.8
kJ
respectively at
25
∘
C
25^\circ\text{C}
2
5
∘
C
and 1 atmosphere pressure. Calculate
Δ
H
\Delta H
Δ
H
and
Δ
U
\Delta U
Δ
U
of the reaction
NH
4
NO
3
(
s
)
⟶
N
2
O
(
g
)
+
2
H
2
O
(
l
)
\text{NH}_4\text{NO}_3(s) \longrightarrow \text{N}_2\text{O}(g) + 2\text{H}_2\text{O}(l)
NH
4
NO
3
(
s
)
⟶
N
2
O
(
g
)
+
2
H
2
O
(
l
)
.
Related theory
Thermodynamics
Types of enthalpy
Measurement of $\Delta U$ and $\Delta H$
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