训练(二十八) 反应热的计算及比较1.(2021·山东淄博期初调研)已知:25℃、101kPa,H2(g)+O2(g)===H2O(g) ΔH=-241.8kJ·mol-1C(s)+O2(g)===CO(g)ΔH=-110.5kJ·mol-1将煤转化为清洁气体燃料时反应C(s)+H2O(g)===H2(g)+CO(g)的ΔH是( )A.-131.3kJ·mol-1 B.+131.3kJ·mol-1C.+352.3kJ·mol-1D.-352.3kJ·mol-1B [将题给热化学方程式依次编号为①②,由②-①可得:C(s)+H2O(g)===H2(g)+CO(g),根据盖斯定律,该反应的ΔH=(-110.5kJ·mol-1)-(-241.8kJ·mol-1)=+131.3kJ·mol-1。]2.(2021·湖北武汉联考)根据以下热化学方程式,ΔH1和ΔH2的大小比较错误的是( )A.2H2S(g)+3O2(g)===2SO2(g)+2H2O(l) ΔH12H2S(g)+O2(g)===2S(s)+2H2O(l) ΔH2则ΔH1>ΔH2B.Br2(g)+H2(g)===2HBr(g) ΔH1Br2(l)+H2(g)===2HBr(g) ΔH2则ΔH1