题目

．下列两组热化学方程式中，有关ΔH的比较正确的是( ) ①CH4(g)＋2O2(g)===CO2(g)＋2H2O(g) ΔH1 CH4(g)＋2O2(g)===CO2(g)＋2H2O(l) ΔH2 ②NaOH(aq)＋H2SO4(浓)===Na2SO4(aq)＋H2O(l) ΔH3 NaOH(aq)＋CH3COOH(aq)===CH3COONa(aq)＋H2O(l) ΔH4 A.ΔH1>ΔH2；ΔH3<ΔH4．               B．ΔH1>ΔH2；ΔH3>ΔH4 C．ΔH1＝ΔH2；ΔH3<ΔH4               D．ΔH1<ΔH2；ΔH3<ΔH4如图所示，螺旋测微器的读数为 mm．