题目内容
已知298K时下述反应:
①C(s)+1/2O2(g)=CO(g)△H1=-110.5kJ?mol-1
②CO(g)+1/2O2(g)=CO2(g)△H2=-283.0kJ?mol-1
③C(s)+CO2(g)=2CO(g)△H3,
则△H3等于( )
①C(s)+1/2O2(g)=CO(g)△H1=-110.5kJ?mol-1
②CO(g)+1/2O2(g)=CO2(g)△H2=-283.0kJ?mol-1
③C(s)+CO2(g)=2CO(g)△H3,
则△H3等于( )
A.172.5kJ?mol-1 | B.-172.5kJ?mol-1 |
C.393.5kJ?mol-1 | D.-393.5kJ?mol-1 |
①C(s)+1/2O2(g)=CO(g)△H1=-110.5kJ?mol-1
②CO(g)+1/2O2(g)=CO2(g)△H2=-283.0kJ?mol-1
依据盖斯定律①-②得到:C(s)+CO2(g)=2CO(g)△H3=172.5kJ?mol-1
故选A.
②CO(g)+1/2O2(g)=CO2(g)△H2=-283.0kJ?mol-1
依据盖斯定律①-②得到:C(s)+CO2(g)=2CO(g)△H3=172.5kJ?mol-1
故选A.
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