Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 5
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1015. In the upper atmosphere, oxygen exists as O
(g), as ozone, O
(g), and as individual
2
3
oxygen atoms, O(g). Ozone and atomic oxygen react to form two molecules of oxygen
gas. The enthalpy change is –392 kJ and the activation energy is +19.0 kJ. Draw and
label a potential energy diagram. Include a value for E
.
a(rev)
What Is Required?
You need to determine the value of E
for a reaction and draw and label a potential
a(rev)
energy diagram.
What Is Given?
You know the activation energy of the forward reaction: E
= +19 kJ
a(fwd)
You know the enthalpy change of the forward reaction: H
= –392 kJ
r
Plan Your Strategy
Act on Your Strategy
Use the formula
'
H
E
E
r
a(fwd)
a(rev)
to determine
'
H
E
E
–392 kJ
19 kJ –
E
r
a(fwd)
a(rev)
a (rev)
E
411 kJ
.
E
a(rev)
a rev
Draw and label a potential energy
diagram.
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.
128 MHR
Chemistry 12 Solutions Manual 978-0-07-106042-4
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