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Calculate the enthalpy change when 6.80 g of is passed over heated CuO
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
Calculate the enthalpy change when 6.80 g of
NH
3
\text{NH}_3
NH
3
is passed over heated CuO. The standard heat enthalpies of
NH
3
(
g
)
\text{NH}_3(g)
NH
3
(
g
)
,
CuO
(
s
)
\text{CuO}(s)
CuO
(
s
)
and
H
2
O
(
l
)
\text{H}_2\text{O}(l)
H
2
O
(
l
)
are
−
46.0
-46.0
−
46.0
,
−
155.0
-155.0
−
155.0
and
−
285.0
kJ mol
−
1
-285.0 \text{ kJ mol}^{-1}
−
285.0
kJ mol
−
1
respectively and the change is
NH
3
+
3
2
CuO
⟶
1
2
N
2
(
g
)
+
3
2
H
2
O
(
l
)
+
3
2
Cu
(
s
)
\text{NH}_3 + \frac{3}{2}\text{CuO} \longrightarrow \frac{1}{2}\text{N}_2(g) + \frac{3}{2}\text{H}_2\text{O}(l) + \frac{3}{2}\text{Cu}(s)
NH
3
+
2
3
CuO
⟶
2
1
N
2
(
g
)
+
2
3
H
2
O
(
l
)
+
2
3
Cu
(
s
)
.
Related theory
Stoichiometric Calculations
Thermodynamics
Types of enthalpy
Enthalpy Changes of Reactions
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