题目内容
| 沼气是一种能源，它的主要成分是CH4。0.5 mol CH4完全燃烧生成CO2和液态H2O时，放出445 kJ的热量，则下列热化学方程式中正确的是 |
A．2CH4(g)＋4O2(g)＝2CO2(g)＋4H2O(l) ΔH＝＋890 kJ/mol B．CH4(g)＋2O2(g)＝CO2(g)＋2H2O(l) ΔH＝＋890 kJ/mol C．CH4(g)＋2O2(g)＝CO2(g)＋2H2O(l) ΔH＝－890 kJ/mol D．1/2CH4(g)＋O2(g)＝1/2CO2(g)＋H2O(l) ΔH＝－890 kJ/mol |
试题答案
CA.2CH4（g）+4O2（g）→2CO2（g）+4H2O（l）；ΔH=+890 kJ·mol－1
B.CH4（g）+2O2（g）→CO2（g）+2H2O（l）；ΔH=+890 kJ·mol－1
C.CH4（g）+2O2（g）→CO2（g）+2H2O（l）；ΔH=－890 kJ·mol－1
D.
CH4（g）+O2（g）→
CO2（g）+H2O（l）；ΔH=－890 kJ·mol－1
A.2CH4(g)+4O2(g)
2CO2(g)+4H2O(l)；ΔH=+890 kJ· mol-1
B.CH4(g)+2O2(g)
CO2(g)+2H2O(l)；ΔH=+890 kJ· mol-1
C.CH4(g)+2O2(g)
CO2(g)+2H2O(l)；ΔH=-890 kJ· mol-1
D.1/2CH4(g)+O2(g)
1/2CO2(g)+H2O(l)；ΔH=-890 kJ· mol-1
A.2CH4(g)+4O2(g)
2CO2(g)+4H2O(l) ΔH=890 kJ·mol-1
B.CH4(g)+2O2(g)
CO2(g)+2H2O(l) ΔH=890 kJ·mol-1
C.CH4(g)+2O2(g)
CO2(g)+2H2O(l) ΔH=-890 kJ·mol-1
D.1/2CH4(g)+O2(g)
1/2CO2(g)+H2O(l) ΔH=-890 kJ·mol-1
A.2CH4(g)+4O2(g)====2CO2(g)+4H2O(l);ΔH=+890 kJ·mol-1
B.CH4(g)+2O2(g)====CO2(g)+2H2O(l);ΔH=+890 kJ·mol-1
C.CH4(g)+2O2(g)====CO2(g)+2H2O(l);ΔH=-890 kJ·mol-1
D.
CH4(g)+2O2(g)====
CO2(g)+2H2O(l);ΔH=-890 kJ·mol-1
沼气是一种能源，它的主要成分是CH4。0.5 mol CH4完全燃烧生成CO2和H2O时，放出445 kJ热量，则下列热化学方程式中正确的是
A.2CH4(g)＋4O2(g)===2CO2(g)＋4H2O(l) ΔH=＋890 kJ·mol－1
B.CH4(g)＋2O2(g)===CO2(g)＋2H2O(l) ΔH=＋890 kJ·mol－1
C.CH4(g)＋2O2(g)===CO2(g)＋2H2O(l) ΔH=－890 kJ·mol－1
D.1/2CH4(g)＋O2(g)===1/2CO2(g)＋H2O(l) ΔH=－890 kJ·mol－1
查看习题详情和答案>>沼气是一种能源，它的主要成分是CH4。0.5 mol CH4完全燃烧生成CO2和液态H2O时，放出445kJ热量，则下列热化学方程式中正确的是
A．2CH4(g)+4O2 (g)=2CO2(g)+4H2O(L)；△H=+890KJ·mol-1
B．CH4(g)+2O2 (g)=CO2(g)+ 2H2O(L)；△H=+890KJ·mol-1
C．CH4(g)+2O2 (g)= CO2(g)+ 2H2O(L)； △H=－890KJ·mol-1
D．
CH4(g)+O2 (g)= CO2(g)+ H2O(L) ；△H=－890KJ·mol-1
沼气是一种能源，它的主要成分是CH4。0.5 mol CH4完全燃烧生成CO2和液态水时放出445 kJ的热量，则下列热化学方程式中正确的是
A．2CH4(g)+4O2(g)==2CO2(g)+4H2O(1) △H= +1780 kJ/mol
B．CH4(g)+2O2(g)==CO2(g)+2H2O(l) △H= +890 kJ/mol
C．CH4(g)+2O2(g)==CO2(g)+2H2O(1) △H= —890 kJ/mol
D．
CH4(g)+O2(g)==CO2(g)+H2O(1) △H= —890 kJ/mol
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沼气是一种能源，它的主要成分是CH4。0.5 mol CH4完全燃烧生成CO2和液态水时放出445 kJ的热量，则下列热化学方程式中正确的是( )
A．CH4(g)+2O2(g)==CO2(g)+2H2O(1) △H= —890 kJ/mol
CH4(g)+2O2(g)==CO2(g)+2H2O(l) △H= +890 kJ/mol
C．2CH4(g)+4O2(g)==2CO2(g)+4H2O(1) △H= +1780 kJ/mol
D．1/2 CH4(g)+O2(g)==1/2CO2(g)+H2O(1) △H= —890 kJ/mol
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