easurements show that the energy of a mixture of gaseous reactants increases by 178. kJ during a certain chemical reaction, which is carried out at a onstant pressure. Furthermore, by carefully monitoring the volume change it is determined that – 143. 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 O kJ significant digits. O exothermic Is the reaction exothermic or endothermic? O endothermic

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