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For the reaction at 298 K
CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics
Problem
For the reaction
2
NO
(
g
)
+
O
2
(
g
)
→
2
NO
2
(
g
)
2\,\text{NO}(g) + \text{O}_2(g) \rightarrow 2\,\text{NO}_2(g)
2
NO
(
g
)
+
O
2
(
g
)
→
2
NO
2
(
g
)
at 298 K, the standard enthalpies of formation are
Δ
H
f
∘
(
NO
)
=
90.4
kJ mol
−
1
\Delta H_f^{\circ}(\text{NO}) = 90.4\,\text{kJ mol}^{-1}
Δ
H
f
∘
(
NO
)
=
90.4
kJ mol
−
1
and
Δ
H
f
∘
(
NO
2
)
=
−
33.2
kJ mol
−
1
\Delta H_f^{\circ}(\text{NO}_2) = -33.2\,\text{kJ mol}^{-1}
Δ
H
f
∘
(
NO
2
)
=
−
33.2
kJ mol
−
1
. Calculate the standard enthalpy change,
Δ
H
rxn
∘
\Delta H^{\circ}_{\text{rxn}}
Δ
H
rxn
∘
, for the reaction in kJ.
Related theory
Thermodynamics
Types of enthalpy
Enthalpy Changes of Reactions
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