Measurements show that enthalpy of a mixture of gaseous reactants decreases by 228. 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 - 55kJ of work is done on the mixture during the reaction.

Calculate the change in energy of the gas mixture during the reaction.

Is the reaction exothermic or endothermic?

Question

Dallas Harrington

Chemistry

30 December, 02:19

Measurements show that enthalpy of a mixture of gaseous reactants decreases by 228. 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 - 55kJ of work is done on the mixture during the reaction.

Calculate the change in energy of the gas mixture during the reaction.

Is the reaction exothermic or endothermic?

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Answers (1)

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Melissa Kline · Answer 1

Total change in energy = Heat produced by system + work done on the system

= 228 - 55

= 173 kJ

Because this energy is released as heat, the reaction is exothermic.