Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 8
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1018. When steam is passed over hot iron, a reaction occurs as shown below.
o
3Fe(s) + 4H
O(g)
m Fe
O
(s) + 4H
(g)
= –151.2 kJ
H
2
3
4
2
r
The activation energy for the reverse reaction, E
, is +200.71 kJ.
a(rev)
a. Calculate the activation energy for the forward reaction.
b. Draw a labelled potential energy diagram showing the enthalpy change, and the
activation energies for the forward and reverse reactions.
What Is Required?
You need to calculate the activation energy for a forward reaction.
You need to draw a labelled potential energy diagram showing the enthalpy change,
and the activation energies for the forward and reverse reactions.
What Is Given?
You know the enthalpy change of the forward reaction: H
= –151.2 kJ/mol
r
You know the activation energy of the reverse reaction: E
= +200.71 kJ
a(rev)
Plan Your Strategy
Act on Your Strategy
a. Use the
'
H
E
E
r
a(fwd)
a(rev)
formula
to
'
H
E
E
151.2 kJ
200.71 kJ
E
r
a(fwd)
a(rev)
a (fwd)
calculate E
.
E
49.5 kJ
a(fwd)
a (fwd)
b. Draw a labelled energy profile
diagram.
Diagram shows that the reactants have higher
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 exothermic so the potential
energy of the products should be lower than the potential energy of the reactants.
Unit 3 Part B
MHR 131
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