Which of the following statements regarding the heat of reaction is/are CORRECT?
- For endothermic reaction, it is positive.
- For exothermic reaction, it is negative.
- For exothermic reaction, it is positive.
- It is the enthalpy change for a process in which stoichiometric quantities of reactants, at a temperature and pressure, react completely in a single reaction to form products at the same temperature and pressure.
