Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 9
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1019. The decomposition of dinitrogen tetroxide(g), N
O
(g), to nitrogen dioxide, NO
(g), is
2
4
2
a reversible reaction. The activation energy for the decomposition reaction is +58.6 kJ.
N
O
(g) + 55.3 kJ → 2NO
(g)
2
4
2
Draw a potential energy diagram for the reaction showing appropriate labels for both
axes, E
, E
, and H
.
a(fwd)
a(rev)
r
What Is Required?
You must calculate the activation energy for the reverse reaction and draw a potential
energy diagram for the reaction showing appropriate labels for both axes, E
,
a(fwd)
E
, and H
.
a(rev)
r
What Is Given?
You know the enthalpy change of the forward reaction: H
= +55.3 kJ/mol
r
You know the activation energy of the forward reaction: E
= +55.3 kJ
a(fwd)
Plan Your Strategy
Act on Your Strategy
Use the formula
'
H
E
E
r
a(fwd)
a(rev)
to calculate
'
H
E
E
55.3 kJ
58.6
E
r
a(fwd)
a(rev)
a (rev)
E
3.3 kJ
.
E
a(rev)
a (rev)
Draw a labelled energy profile
diagram.
Diagram shows that the reactants have lower
potential energy than the products. The
activated complex, having the highest potential
energy, is positioned between the reactants and
products.
Check Your Solution
Check that the labels are all included. The reaction is endothermic with a small
activation energy for the reverse reaction. The potential energy of the products should
be higher than the potential energy of the reactants.
132 MHR
Chemistry 12 Solutions Manual 978-0-07-106042-4
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