Luke Edition Elective 4 1.1 "Thermal Effects of Chemical Reactions" ppt (1) The temperature and pressure of the reaction (if not specified as 25 ℃, 101 kPa) must be indicated (2) The state of aggregation of the reactants and products must be indicated, not used Standard precipitation and gas symbols (3) The coefficients in the thermochemical equation only represent the amount of the substance, so they can be integers or fractions. However, the value of the reaction heat must correspond to the coefficient. (4) "-" for exothermic heat and "+" for endothermic heat, unit kJ / mol (5) The reaction proceeds in the reverse direction, the value of the reaction heat is equal to the positive reaction, and the sign is opposite
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