Question

Calculate the enthalpy change for the isomerization reaction of butene-1 to cis-2-butene. Given that the standard enthalpy of formation for butene-1 is -19.8 kJ/mol and for cis-2-butene is -20.4 kJ/mol, and the standard enthalpy of combustion for butene-1 is -2876 kJ/mol.

Answer 1

To calculate the enthalpy change for the isomerization reaction of butene-1 to cis-2-butene, we can use the following formula:H_reaction = H_f products  - H_f reactants In this case, the reactant is butene-1 and the product is cis-2-butene. We are given the standard enthalpy of formation for both butene-1 and cis-2-butene:H_f butene-1  = -19.8 kJ/molH_f cis-2-butene  = -20.4 kJ/molNow, we can plug these values into the formula:H_reaction =  -20.4 kJ/mol  -  -19.8 kJ/mol H_reaction = -0.6 kJ/molTherefore, the enthalpy change for the isomerization reaction of butene-1 to cis-2-butene is -0.6 kJ/mol.