Question

What is the total energy required to break all the bonds in 1 mol hexane C6H14?A) 760 kJB) 5780 kJC) 1740 kJD) 7520 kJ

Answer 1

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Answer 2

The total energy to break the hexane bonds will be equal to the sum of each of the energy to break each bond.

So the first thing we're going to do is determine how many and what type of bonds hexane has. Hexane is an alkane, meaning the C-C bonds are all single bonds. We also have C-H bonds. According to the structure of hexane, we will count each of the bonds in the following figure:

The number of C-H bonds is written in blue, we see that there are 14 C-H bonds, which coincides, being an alkane, with the number of hydrogen atoms.

The number of C-C bonds is written in orange. The number of C-C bonds is equal to 5.

Now, we multiply the energy to break each bond by the number of bonds and add the energy of the C-H and C-C bonds.

`TotalEnergy=14* Energy(C-H)+5* Energy(C-C)`
`\begin{gathered} TotalEnergy=14*413kJ/mol+5*347kJ/mol \\ TotalEnergy=7517kJ/mol \end{gathered}`

So, for 1 mol of hexane the energy. required to break all the bonds will be 7514kJ

Answer: The closest value to the answer is 7520. D) 7520 kJ