● 例：Na(s)+H,00→NaOH(aq)+1/2H2g) 4,H9m=-184kJmo1 CH4(g)+202→C02(g)+2H20(g) 4,Hm=-802kJ-mo1 C0(g)→C(s)+1/202 H9=111 kJ-mol-i 矛盾，NHCI固体溶解于水，吸热、自发 △ CaCO,(s) CaO(s)+CO,(g) ●例：Na(s) + H2O(l) → NaOH(aq) + 1/2H2 (g) rH m = -184 kJmol-1 CH4 (g) + 2O2 → CO2 (g) + 2H2O(g) rH m = -802 kJmol-1 CO(g) → C(s) +1/2O2 rH m = 111 kJmol-1 矛盾，NH4Cl固体溶解于水，吸热、自发  CaCO3 (s) = CaO(s) + CO2 (g)