1克氢气燃烧生成液态水放出142.9 kJ热量,表示该反应的热化学方程式正确的是( )
A.2H2(g)+O2(g)=2H2O(l);△H="-285.8" kJ/mol |
B.H2(g)+1/2O2(g)=H2O(g);△H=-142.9kJ/mol |
C.H2O(l)=H2(g)+1/2O2(g); △H="+285.8" kJ/mol |
D.2H2+O2=2H2O;△H="-571.6" kJ/mol |
1克氢气燃烧生成液态水放出142.9 kJ热量,表示该反应的热化学方程式正确的是( )
A.2H2(g)+O2(g)=2H2O(l);△H="-285.8" kJ/mol |
B.H2(g)+1/2O2(g)=H2O(g);△H=-142.9kJ/mol |
C.H2O(l)=H2(g)+1/2O2(g); △H="+285.8" kJ/mol |
D.2H2+O2=2H2O;△H="-571.6" kJ/mol |
试题篮
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