摘要: (1)H2(g)+1/2O2(g)=H2O(l); ΔH= -286 kJ·mol-1 283a kJ<Q<890a kJ (4)284.5a kJ<Q<586.5a kJ
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已知
(1)H2+1/2O2=H2O(g) △H1=a kJ﹒mol-1
(2)2H2+O2=2H2O(g) △H2=b kJ﹒mol-1
(3)H2+1/2O2=H2O(l) △H3=c kJ﹒mol-1
(4)2H2+O2=2H2O(l) △H4=dkJ﹒mol-1
下列关系式中正确的是
(1)H2+1/2O2=H2O(g) △H1=a kJ﹒mol-1
(2)2H2+O2=2H2O(g) △H2=b kJ﹒mol-1
(3)H2+1/2O2=H2O(l) △H3=c kJ﹒mol-1
(4)2H2+O2=2H2O(l) △H4=dkJ﹒mol-1
下列关系式中正确的是
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A.2a=b<0
B.b>d>0
C.a<c <0
D.2c=d>0
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B.b>d>0
C.a<c <0
D.2c=d>0
已知下列热化学方程式:(l) C(s)+1/2O2(g)=CO(g)△H=△H1
(2)2H2(g)+O2(g)=2H2O(g)△H=△H2
由此可知 C(s)+H2O(g)═CO(g)+H2(g)△H3.则△H3等于( )
(2)2H2(g)+O2(g)=2H2O(g)△H=△H2
由此可知 C(s)+H2O(g)═CO(g)+H2(g)△H3.则△H3等于( )
下列各组热化学方程式中,△H前者大于后者的是( )
①C(s)+O2(g)=CO2(g); C(s)+1/2O2(g)=CO(g)
②S(s)+O2(g)=SO2(g); S(g)+O2(g)=SO2(g)
③H2(g)+1/2O2(g)=H2O(l); 2H2(g)+O2(g)=2H2O(l)
④2KOH (aq)+H2SO4(a)=K2SO4(aq)+2H2O (l);2KOH (aq)+H2SO4(浓)=K2SO4(aq)+2H2O (l)
①C(s)+O2(g)=CO2(g); C(s)+1/2O2(g)=CO(g)
②S(s)+O2(g)=SO2(g); S(g)+O2(g)=SO2(g)
③H2(g)+1/2O2(g)=H2O(l); 2H2(g)+O2(g)=2H2O(l)
④2KOH (aq)+H2SO4(a)=K2SO4(aq)+2H2O (l);2KOH (aq)+H2SO4(浓)=K2SO4(aq)+2H2O (l)
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甲醇质子交换膜燃料电池中将甲醇蒸气转化为氢气的两种反应原理是:
①CH3OH(g)+H2O(g)=CO2(g)+3H2(g);△H=+49.0 kJ?mol-1
②CH3OH(g)+1/2O2(g)=CO2(g)+2H2(g);△H=-192.9 kJ?mol-1
下列说法正确的是( )
①CH3OH(g)+H2O(g)=CO2(g)+3H2(g);△H=+49.0 kJ?mol-1
②CH3OH(g)+1/2O2(g)=CO2(g)+2H2(g);△H=-192.9 kJ?mol-1
下列说法正确的是( )
A、反应①中的能量变化如图所示 | ||
B、CH3OH的燃烧热为192.9kJ?mol-1 | ||
C、CH3OH转变成H2的过程一定要吸收能量 | ||
D、根据②推知反应:CH3OH(l)+
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