Measurements show that the energy of a mixture of gaseous reactants decreases by 133. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 84, kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture during the reaction. Round your answer to 3 significant digits. x O exothermic Is the reaction exothermic or endothermic? O endothermic 4 2