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CO的燃烧热为283 kJ 右图可表示由CO生成CO2的反应过程和能量关系 2Na2O2(s)+2CO2(s)=2Na2CO3(s)+O2(g) △H= - 452 kJ/mol CO(g)与Na2O2(s)反应放出509 kJ热量时,电子转移数为2x6.02×l023
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
-82kJ/mol -41kJ/mol -312kJ/mol +82kJ/mol
ΔH1>0,ΔH3<0 ΔH2>0,ΔH4>0 ΔH1=ΔH2+ΔH3 ΔH3=ΔH4+ΔH5
CO的燃烧热为283 kJ 右图可表示由CO生成CO2的反应过程和能量关系 2Na2O2(s)+2CO2(s)=2Na2CO3(s)+O2(g) ΔH.>-452 kJ/mol CO(g)与Na2O2(s)反应放出509 kJ热量时,电子转移数为6.02×1023
CH3OH的燃烧热为192.9 kJ/mol 反应①中的能量变化如右图所示 CH3OH转变成H2的过程一定要吸收能量 根据②推知:CH3OH(l)+1/2O2(g)=CO2(g)+2H2(g) ΔH > -192.9kJ/mol
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
CH4(g)+2O2(g)=CO2(g)+2H2O(L) 2CH4(g)+4O2(g)=2CO2(g)+4 H2O(L) CH 4g+2O2(g)=CO2(g)+2H2O(g) 2CH4(g)+4O2(g)=2CO2(g)+4H2O(g)
加催化剂 增加CO2的浓度 减少CO的浓度 升高温度
CH4 (g)+2NO2 (g)= N2 (g)+CO2 (g)+2H2O (l) △H.=-867 kJ·mol-1 若0.2 mol CH4还原NO2至N2,在上述条件下放出的热量为173.4 kJ 1molCH4催化还原NOx为N2的过程中,若x=1.6,则转移的电子为3.2 mol 若用4.48L CH4还原NO2至N2,整个过程中转移的电子为3.2 mol
C.(s) + 1/2 O2(g) = CO(g) △H= -110.5 kJ/mol 2H2(g) + O2(g) = 2H2O(l) △H= -571.6kJ/mol CH4(g) + 2O2(g) = CO2(g) + 2H2O(g) △H= -802.3kJ/mol CO(g) + 1/2 O2(g) = CO2(g) △H= -283.0kJ/mol