Measurements show that the enthalpy of a mixture of gaseous reactants increases by 186. 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 - 179. kJ of work is done on the mixture during the reaction. Calculate the change in energy of the gas mixture during the reaction. Round your answer to 1 significant digit. kJ Is the reaction exothermic or endothermic? exothermic endothermic

Question

Chemistry

Franklin Pearson

28 September, 02:40

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 186. 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 - 179. kJ of work is done on the mixture during the reaction. Calculate the change in energy of the gas mixture during the reaction. Round your answer to 1 significant digit. kJ Is the reaction exothermic or endothermic? exothermic endothermic

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Douglas Nielsen · Answer 1

To begin with, as Delta H = variation in enthalpy is >0, it means rxn is endothermic.

The rule says: Delta U = Delta H + W = 186 - 179 = 7 kJ.

Where Delta U is variation in internal energy and W is the work done.