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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
烧菜用过的铁锅,经放置常出现红棕色斑迹 用煤气灶燃烧沼气[主要成分为甲烷(CH4中 为-4价)为炒菜提供热量C.铜质炊具长久不用生铜绿。 灶具大理石板被食醋腐蚀变得不光滑
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)