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-1940kJ·mol-1 1940kJ·mol-1 -485kJ·mol-1 485kJ·mol-1
﹣1940 kJ·mol﹣1 +1940 kJ·mol﹣1 ﹣485 kJ·mol﹣1 +485 kJ·mol﹣1
﹣1940 kJ•mol﹣1 +1940 kJ•mol﹣1
﹣485 kJ•mol﹣1 +485 kJ•mol﹣1
(c+b-2a) kJ・mol―1 (c+b-4a) kJ・mol―1 (2c+b-2a) kJ・mol―1 (2c+b-4a) kJ・mol―1
-1940kJ·mol-1 1940kJ·mol-1 .-485kJ·mol-1 485kJ·mol-1
-1940kJ·mol-1 1940kJ·mol-1 -485kJ·mol-1 485kJ·mol-1
-1 940 kJ·mol-1 1 940 kJ·mol-1 -485 kJ·mol-1 485 kJ·mol-1
+485 kJ·mol﹣1 ﹣485 kJ·mol﹣1 +1940 kJ·mol﹣1 ﹣1940 kJ·mol﹣1
-1 940 kJ·mol-1 1 940 kJ·mol-1 -485 kJ·mol-1 485 kJ·mol-1
-1 940 kJ·mol-1 1 940 kJ·mol-1 .-485 kJ·mol-1 485 kJ·mol-1
-1 940 kJ·mol-1 1 940 kJ·mol-1 -485 kJ·mol-1 485 kJ·mol-1
成键时电子数越多,键能越大
键长越长,键能越小
成键所用的电子数越少,键能越大
成键时电子对越多,键能越大
+1940 kJ·mol-1 -1940 kJ·mol-1 -485 kJ·mol-1 +485 kJ·mol-1