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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
放出的热量为(0.4Q1+0.1Q3)KJ 放出的热量为(0.4Q1+0.05Q2)KJ 放出的热量为(0.4Q1+0.05Q3)KJ △H2 <△H3
HCl+NaOH= NaCl+H2O ΔH.<0 2CH3OH(l)+3O2(g) =2CO2(g)+4H2O(l) ΔH.<0 4Fe(OH)2(s)+2H2O(l)+O2(g) = 4 Fe(OH)3(s) ΔH.<0 2H2(g)+O2(g) =2H2O(l) ΔH.<0
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)
放出的热量为(0.4Q1+0.05Q3)KJ/mol 放出的热量为(0.4Q1+0.05Q2)KJ/mol △H2 > △H3 △H2 <△H3
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