Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 3
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1013. Consider the reaction below:
C + D → CD
E
= +61 kJ,
E
= +150 kJ
a(fwd)
a(rev)
Draw and label a potential energy diagram for this reaction. Calculate and label
.
H
r
What Is Required?
You need to draw and label a potential energy diagram for this reaction and
calculate and label H
.
r
What Is Given?
You know the activation energy of the forward reaction: E
= +61 kJ
a(fwd)
You know the activation energy of the reverse reaction: E
= +150 kJ
a(rev)
Plan Your Strategy
Act on Your Strategy
Use the formula
'
H
E
E
r
a(fwd)
a(rev)
to calculate
'
H
E
E
61 kJ
150 kJ
r
a(fwd)
a(rev)
H
.
89 kJ
r
Draw and label the potential
energy diagram.
is the energy difference between the
E
a(rev)
transition state and the products (+150 kJ). H
is
r
the enthalpy of reaction between the reactants and
the products
(–89 kJ).
Check Your Solution
Since the sign of H
is negative, the reaction is exothermic. The diagram correctly
r
shows the potential energy of the product lower than the potential energy of the
reactant.
126 MHR
Chemistry 12 Solutions Manual 978-0-07-106042-4
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