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沼气的主要成分是CH4。0.5 mol CH4完全燃烧生成CO2和液态水时,放出445kJ热量。下列热化学方程式中,正确的是:

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±0.20%CH4  ±0.10%CH4  ±0.01%CH4  ±0.05%CH4  
CH4(g)+2O2(g)=CO2(g)+4H2O(g)  ΔH=-890 kJ/mol   CH4(g)+2O2(g)=CO2(g)+2H2O(l)  ΔH=+890 kJ/mol   CH4(g)+2O2(g)=CO2(g)+2H2O(l)  ΔH=-890 kJ/mol   CH4(g)+O2(g)=CO2(g)+H2O(l)  ΔH=-890 kJ/mol  
≥1.0%CH4;≥1.0%CH44;<1.0%CH4  ≥1.5%CH4;≥1.5%CH44;<1.0%CH4  ≥1.0%CH4;≥1.5%CH44;<1.0%CH4  ≥1.5%CH4;≥1.0%CH44;<1.0%CH4  
≥1.0%CH4;≥1.0%CH4;  ≥1.5%CH4;≥1.5%CH4;  ≥1.0%CH4;≥1.5%CH4;  ≥1.5%CH4;≥1.0%CH4;  
2CH4( g)+4O2(g)=2CO2(g)+4H2O(1) △H = +890kJ·mol-1   CH4(g)+2O2(g)=CO2(g)+2H2O(g) △H = +890 kJ·mol-1   1/2CH4(g)+O2(g)=1/2CO2(g)+H2O(g) △H = —445 kJ·mol-1    CH4(g)+2O2(g)=CO2(g)+2H2O(1) △H = —890 kJ·mol-1  
2CH4(g)+4O2(g)=2CO2(g)+4H2O(l) △H=+890 kJ·mol-1   CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=+890 kJ·mol-1   CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-890 kJ·mol-1   CH4(g)+O2(g)=CO2(g)+H2O(l) △H=-890 kJ·mol-1  
±0.1%CH4  ±0.2%CH4  0.1%CH4  0.2%CH4  
0.04%CH4,0.4%CH4  0.1%CH4,0.4%CH4  0.02%CH4,0.4%CH4  0.1%CH4,0.5%CH4  
0.1%CH4,0.1%CH4  0.1%CH4,0.4%CH4  0.01%CH4,0.1%CH4  0.01%CH4,0.01%CH4  
≥0.5%CH4,≥0.5%CH4,<0.5%CH4  ≥1.5%CH4,≥1.5%CH4,<1.5%CH4  ≥1.0%CH4,≥1.0%CH4,<1.0%CH4  
沼气(CH4)  赤铁矿(Fe3O.4)  酒精(C.2H.5OH)  石灰石(CaCO3)  

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