Question

Calculate the enthalpy change of isomerization for the conversion of cis-2-butene to trans-2-butene, given that the heat of combustion of cis-2-butene is -3283.1 kJ/mol and the heat of combustion of trans-2-butene is -3336.8 kJ/mol. Assume that the heat of combustion is representative of the enthalpy of formation.

Answer 1

To calculate the enthalpy change of isomerization for the conversion of cis-2-butene to trans-2-butene, we can use the following equation:H_isomerization = H_f trans-2-butene  - H_f cis-2-butene Since the heat of combustion is representative of the enthalpy of formation, we can use the given values:H_isomerization =  -3336.8 kJ/mol  -  -3283.1 kJ/mol H_isomerization = -53.7 kJ/molThe enthalpy change of isomerization for the conversion of cis-2-butene to trans-2-butene is -53.7 kJ/mol.