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-1940kJ·mol-1 1940kJ·mol-1 -485kJ·mol-1 485kJ·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
(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
1/2A2(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
-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
1/2H2(g)+ 1/2Cl2(g)=HCl(g);△H=-91.5 kJ・mol-1 H2(g)+ Cl2(g)=2HCl(g); △H=-183 kJ・mol-1 1/2H2(g)+ 1/2Cl2(g)=HCl(g);△H=+91.5 kJ・mol-1 2HCl(g)= H2(g)+ Cl2(g); △H=+183kJ・mol-1
+236 kJ·mol-1 -236 kJ·mol-1 .+412 kJ·mol-1 -412 kJ·mol-1
SiCl4的熔点比SiC低 拆开1 mol晶体硅中的化学键所吸收的能量为176kJ HCl的熔点比H2高 拆开1 mol晶体SiC中的化学键所吸收的能量为1388kJ
+1940 kJ·mol-1 -1940 kJ·mol-1 -485 kJ·mol-1 +485 kJ·mol-1