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CHM1 12Example10b Collection

Last modified by
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Oct 18, 2019, 1:17:49 AM
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Oct 18, 2019, 1:17:49 AM
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19babe13-f145-11e9-8682-bc764e2038f2

 Index Page                                                                  

Example 10

See the calculation on this YouTube video

Solution It is best to sketch the molecules and their bonds in order to make sure that none are missed.


/attachments/19babe13-f145-11e9-8682-bc764e2038f2/Methane_combustion.jpg

Thus      ?H° = ?D (bond broken) – ?D (bond formed)

                   = 4 DC?H + 2DO=O – 2DC=O – 4DO?H

                   = (4 × 416 + 2 × 498 – 2 × 803 – 4 × 467) kJ mol–1

                   = – 814 kJ mol–1

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