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4t 2t 
－67.7 kJ·mol－1 －43.5 kJ·mol－1 ＋43.5 kJ·mol－1 ＋67.7 kJ·mol－1
-67.7 kJ/mol -43.5 kJ/mol +43.5 kJ/mol +67.7kJ/mol
－67.7 kJ·mol－1 －43.5 kJ·mol－1 ＋43.5 kJ·mol－1 ＋67.7 kJ·mol－1
＋43.5kJ·mol﹣1 －43.5kJ·mol﹣1 －67.7 kJ·mol﹣1 ＋67.7 kJ·mol﹣1
＋43.5kJ·mol-1 －43.5kJ·mol-1 ＋67.7kJ·mol-1 －67.7kJ·mol-1
-67.7 kJ·mol-1 -43.5 kJ·mol-1 +43.5 kJ·mol-1 +67.7 kJ·mol-1
+43.5 kJ/mol -43.5 kJ/mol -67.7kJ/mol +67.7 kJ/mol
雨点匀速下落 汽车刹车的运动
物体沿斜面匀速下滑 物体做自由落体运动
－67.7 kJ·mol－1 －43.5 kJ·mol－1 ＋43.5 kJ·mol－1 ＋67.7 kJ·mol－1
1 mol H2SO4和1 mol Ba(OH)2完全反应所放出的热量称为中和热 同一物质的固、液、气三种状态的熵值相同 电解水阳极反应式为：O2 + 2H2O + 4e- = 4OH- 已知：HCN(aq)+ NaOH(aq)=== NaCN(aq)+ H2O(l) ΔH = -12.1 kJ/mol HCl(aq)+ NaOH(aq)=== NaCl(aq)+ H2O(l) ΔH = -55.6 kJ/mol 则1 mol HCN在水溶液中电离的ΔH = +43.5 kJ/mol
－67.7kJ/mol －43.5kJ/mol +43.5kJ/mol +67.7kJ/mol
＋43.5 kJ·mol－1 ＋67.7 kJ·mol－1 －43.5 kJ·mol－1 －67.7 kJ·mol－1
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