Question

Calculate the enthalpy change for the isomerization of butene-1 to butene-2 given that the standard enthalpy of formation of butene-1 is -25.3 kJ/mol and the standard enthalpy of formation of butene-2 is -23.6 kJ/mol. The reaction is carried out at a constant pressure of 1 atm and a temperature of 298 K.

Answer 1

To calculate the enthalpy change  H  for the isomerization of butene-1 to butene-2, we can use the following equation:H = Hf products  - Hf reactants In this case, the reactant is butene-1 and the product is butene-2. The standard enthalpy of formation  Hf  for butene-1 is -25.3 kJ/mol, and for butene-2 is -23.6 kJ/mol.The reaction can be written as:butene-1  butene-2Now, we can plug the values into the equation:H =  -23.6 kJ/mol  -  -25.3 kJ/mol H = 1.7 kJ/molThe enthalpy change for the isomerization of butene-1 to butene-2 is 1.7 kJ/mol.