摘要：4．25 ℃.101 kPa下.碳.氢气.甲烷和葡萄糖的燃烧热依次是393.5 kJ/mol.285.8 kJ/mol.890.3 kJ/mol.2 800 kJ/mol.则下列热化学方程式正确的是( ) A．C(s)+O2 ΔH＝-393.5 kJ/mol B．2H2(g)+O2(g)===2H2O(g) ΔH＝+571.6 kJ/mol C．CH4(g)+2O2 (g)===CO2 (g)+2H2O(g) ΔH＝-890.3 kJ/mol D.C6H12O6(s)+3O2(g)===3CO2 (g)+3H2O(l) ΔH＝-1 400 kJ/mol 解析:选D 根据燃烧热的定义.碳的燃烧产物应是二氧化碳,氢气燃烧是放热反应(ΔH<0)且生成液态水,25 ℃时.甲烷的燃烧产物是气态二氧化碳和液态水.
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A.C(s)+
O2(g)
CO(g)ΔH=-393.5 kJ·mol-1
B.2H2(g)+O2(g)
2H2O(g)ΔH=+571.6 kJ·mol-1
C.CH4(g)+2O2(g)
CO2(g)+2H2O(g)ΔH=-890.3 kJ·mol-1
D.
C6H12O6(s)+3O2(g)
3CO2(g)+3H2O(l) ΔH=-1 400 kJ·mol-1
10.25℃、101 kPa下，碳、氢气、甲烷和葡萄糖的燃烧热依次是393.5 kJ/mol、285.8 kJ/mol、890.3 kJ/mol、2800 kJ/mol，则下列热化学方程式正确的是
A.C(s)+
O2(g)==CO(g)；△H=-393.5 kJ/mol
B.2H2(g)+O2(g)==2H2O(g)；△H=+571.6 kJ/mol
C.CH4(g)+2O2(g)==CO2(g)+2H2O(g)；△H=-890.3 kJ/mol
D.
C6H12O6(s)+3O2(g) === 3CO2(g)+3H2O(1)；△H=-1400 kJ/mol
25 ℃、101 kPa下，碳、氢气、甲烷和葡萄糖的燃烧热依次是393.5 kJ·mol-1、285.8 kJ·mol-1、890.3 kJ·mol-1、2 800 kJ·mol-1，则下列热化学方程式正确的是（ ）
A.C(s)+1/2O2(g)====CO(g);ΔH=-393.5 kJ·mol-1
B.2H2(g)+O2(g) ====2H2O(g);ΔH=+571.6 kJ·mol-1
C.CH4(g)+2O2(g) ====CO2(g)+2H2O(g);ΔH=-890.3 kJ·mol-1
D.1/2C6H12O6(s)+3O2(g) ====3CO2(g)+3H2O(1);ΔH=-1 400 kJ·mol-1
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