The standard enthalpies of combustion of cis-2-hexene and trans-2-hexene (to form carbon dioxide and water) are −3727.9 kJ·mol−1 and −3726.3 kJ·mol−1, respectively. Calculate the enthalpy of the following isomerization process.

The enthalpy of the following isomerization process is -1.6kJ/mol.

Explanation:

Combustion of 1 mole of hexane gives 6 moles of carbon dioxide gas and 6 moles of water.

And so will be products of combustion of cis-2-hexene and trans-2-hexene, But energy released during the reaction will be different.

..[1]

[2]

Enthalpy of the isomerization process of cis-2-hexene to trans-2-hexene.

...[3]

[1] - [2] =[3]

(Hess's law)

The enthalpy of the following isomerization process is -1.6kJ/mol.

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