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-1940kJ·mol-1 1940kJ·mol-1 -485kJ·mol-1 485kJ·mol-1
和 所需要的能量(单位为KJ·mol-1)。根据键能数据估算CH4(g)+4F2(g)=CF4(g)+4HF(g)的反应热△H为( ) A.-485KJ·mol-1 B.+485KJ·mol-1 +1940KJ·mol-1 -1940KJ·mol-1
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C.≡C键能为796.0 kJ/mol 2CH4(g)+2O2(g)=2H2O(l) △H=﹣890.3 kJ/mol H2(g)+1/2O2(g)=H2O(g) △H=﹣285.8 kJ/mol 2CH4(g)=C2H2(g)+3H2(g) △H=﹣376.4 kJ/mol
﹣1940 kJ·mol﹣1 +1940 kJ·mol﹣1 ﹣485 kJ·mol﹣1 +485 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
1/2A2(g)+1/2B2(g)=AB(g) ΔH.=-91.5kJ·mol-1 A2(g)+B2(g)=2AB(g) ΔH.=-183kJ·mol-1 2AB(g)=A2(g)+B2(g) ΔH.=+183kJ·mol-1 1/2A2(g)+1/2B2=AB(g) ΔH.=+91.5kJ·mol-1
-1 940 kJ·mol-1 1 940 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
+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
吸收45kJ• mo1-1 放出412 kJ• mo1-1 吸收 236 kJ• mo1-1 放出236 kJ• mo1-1
-1 940 kJ·mol-1 1 940 kJ·mol-1 -485 kJ·mol-1 485 kJ·mol-1
+236 kJ·mol-1 -236 kJ·mol-1 .+412 kJ·mol-1 -412 kJ·mol-1
+1940 kJ·mol-1 -1940 kJ·mol-1 -485 kJ·mol-1 +485 kJ·mol-1