Association-issued **question set P5, multiple-choice questions 1-6
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The detailed content of the question is as follows: 1-6 Which of the following statements regarding the heat of chemical reactions is correct? ( ) (1) The heat of reaction at constant pressure refers to the change in enthalpy of the substances before and after a reaction occurs, when the reactants react completely according to the stoichiometric equation of the chemical reaction, under conditions of constant pressure and temperature. This answer is correct, right? Why? Could someone with more knowledge please explain? In my opinion, a constant temperature isn’t necessary
I got this question wrong too; I then checked and found that it is mentioned on page P84 of the Physical Chemistry textbook from Tianjin University – indeed, it’s under constant temperature and pressure conditions
Specifically, another condition must be added, namely that the non-volume work W” = 0; in other words, under the conditions of dT = 0, dP = 0, and W” = 0, Qp = deta H.