Representing A Reaction With A Potential Energy Diagram Chemistry Worksheet - Unit 2 Part B Page 7
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1017. Refer to the list of molar enthalpies of combustion for hydrocarbons in Table 5.4
(student textbook page 295).
a. Write the balanced thermochemical equation for the combustion of methane gas,
CH
(g).
4
b. Draw a potential energy diagram that would reasonably represent this combustion
reaction. Indicate the H
and a molecular structure that could represent an
comb
activated complex in this potential energy diagram.
What Is Required?
You need to write the thermochemical equation for the combustion of methane and
draw a reasonable energy profile diagram that could represent the process. Include a
molecular structure that could represent an activated complex in the potential energy
diagram.
What Is Given?
From Table 5.4, you know the molar enthalpy of combustion for methane:
o
= –890.8 kJ/mol
'
H
comb
The products for complete combustion are H
O( ) and CO
(g).
2
2
Plan Your Strategy
Act on Your Strategy
a. Table 5.4 gives a negative
CH
(g) + 2O
(g) → CO
(g) + 2H
O( ) + 890.8 kJ
4
2
2
2
value for the heat of combustion
so the equation for the
combustion reaction shows the
heat term as a product.
b. Draw and label potential
energy diagram for the reaction
including a molecular structure
that could represent an activated
complex.
The activated complex would show an unstable
association of one CH
(g) molecule and O
(g)
4
2
molecule with partial bonds.
Check Your Solution
The potential energy diagram should match the given information. An example of the
burning of a hydrocarbon is given in the student text page 367.
130 MHR
Chemistry 12 Solutions Manual 978-0-07-106042-4
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