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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
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)
H2(g) CO(g) C.8H18(l) CH4(g)
H2(g) CO(g) C.8H18(l) CH4(g)
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
25℃ 101kPa时,CH4(g)+2O2(g)=CO2(g) +2H2O(g) △H=-Q kJ/mol, 则甲烷的燃烧热为Q kJ/mol CaCO3(s)=CaO(s)+CO2(g) 室温下不能自发进行,说明该反应的 ΔH<0 反应N2(g)+3H2(g)2NH3(g)ΔH<0达到平衡后,升高温度,反 应速率v(H2)和H2的平衡转化率均增大 已知氯气、溴蒸气分别跟氢气反应的热化学方程式如下(Q1、Q2的值 均大于零): H2(g) +Cl2(g)=2HCl(g) △H1=—Q1 kJ/mol H2(g) +Br2(g)=2HBr(g) △H2=—Q2 kJ/mol 则△H1<△H2
②中CH3OH的反应热为192.9 kJ·mol-1 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推知反应: CH3OH(l)+1/2O2(g)=CO2(g)+2H2(g)的 △H>-192.9kJ·mol-1