一、考查化学反应中的能量任何化学反应都伴随着能量的变化,当反应物的总能量高于生成物的总能量时,反应放热;当反应物的总能量低于生成物的总能量时,反应吸热.例1根据碘与氢气反应的热化学方程式()(i)I2(g)+H2(g)2HI(g)ΔH=-9.48 kJ·mol-1(ii)I2(s)+H2(g)2HI(g)ΔH=+26.48 kJ·mol-1下列判断正确的是()(A)254 g I2(g)中通入2 g H2(g),反应放热9.48 kJ(B)1 mol固态碘与1 mol气态碘所含的能量相差17.00 kJ First, to examine the energy of chemical reactions Any chemical reactions are accompanied by changes in energy, when the total reactant energy is higher than the total energy of the product, the reaction is exothermic; when the total reactant energy is less than the total energy of the product (G) ΔH = -9.48 kJ · mol -1 (ii) I2 (g) + H2 (g) ΔH2 s) + H2 (g) 2HI (g) ΔH = + 26.48 kJ · mol-1 The following is correct () (A) 254 g I2 9.48 kJ (B) The difference between the energy contained in 1 mol of solid iodine and 1 mol of gaseous iodine is 17.00 kJ