Question

Calculate the enthalpy change for the polymerization of propylene to polypropylene, given the enthalpy of formation of propylene is -103.8 kJ/mol and the enthalpy of formation of polypropylene is -45.4 kJ/mol. Assume the reaction occurs at constant pressure and temperature.

Answer 1

To calculate the enthalpy change  H  for the polymerization of propylene to polypropylene, we can use the following equation:H =  H products  -  H reactants In this case, the reactant is propylene and the product is polypropylene. The enthalpy of formation of propylene is given as -103.8 kJ/mol, and the enthalpy of formation of polypropylene is given as -45.4 kJ/mol.Since the reaction involves the conversion of one mole of propylene to one mole of polypropylene, the equation becomes:H =  -45.4 kJ/mol  -  -103.8 kJ/mol H = 58.4 kJ/molTherefore, the enthalpy change for the polymerization of propylene to polypropylene is 58.4 kJ/mol.