To solve this problem, we need to know the molecular weight of the polymer. Let's assume the molecular weight of the polymer is M grams/mol.First, we need to find out how many moles of the polymer are present in 500 grams:moles of polymer = mass of polymer / molecular weight of polymer moles of polymer = 500 grams / M grams/molNow, we can use the Hrxn value to find out the energy released or absorbed during the reaction:Energy = moles of polymer HrxnEnergy = 500 grams / M grams/mol -250 kJ/mol Energy = -125000 / M kJThe energy released or absorbed during the reaction will depend on the molecular weight of the polymer. If you provide the molecular weight, we can calculate the exact amount of energy released or absorbed. Since the Hrxn is negative, the reaction is exothermic, and energy will be released.