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Q1
Bromine reacts with methane in sunlight.
The diagram below shows the displayed formulae for the reaction of
bromine with methane.
The table below shows the bond energies and the overall energy change in
the reaction.
Calculate the bond energy X for the C—Br bond.
Use the diagram and the table above.
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Bond energy X = _______________ kJ/mol
(4)
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Step 1: 412 + 193 = 605 (kJ/mol)
Step 2: 366 + X
Step 3: -51 = 605 – (366 + X)
Step 4: X = 290 kJ/mol
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