摘要：19．已知热化学方程式: ①H2(g)+O2(g)=H2O(g); △H=-241.8kJ·mol-1 ②2H2(g)+O2(g)=2H2O(g); △H=-483.6kJ·mol-1 ③H2(g)+ O2(g)=H2O(1); △H=-285.8kJ·mol-1 k+s-5#u ④2H2(g)+O2(g)=2H2O(1); △H=-571.6kJ·mol-1 则氢气的燃烧热为 ( ) A．241.8kJ·mol-1 B．483.6kJ·mol-1 C．285.8kJ·mol-1 D．571.6kJ·mol-1
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已知热化学方程式：
①H2(g)+
O2(g)
H2O(g) ΔH=－241.8 kJ·mol-1
②2H2(g)+O2(g)2H2O(g) ΔH=－483.6 kJ·mol-1
③H2(g)+ 
O2(g)H2O(l) ΔH=－285.8 kJ·mol-1
④2H2(g)+O2(g)2H2O(l) ΔH=－571.6 kJ·mol-1
则氢气的燃烧热为（ ）
A.241.8 kJ·mol-1 B.483.6 kJ·mol-1 C.285.8 kJ·mol-1 D.571.6 kJ·mol-1
查看习题详情和答案>>已知热化学方程式：
① C2H2(g) +
O2(g) == 2CO2(g)＋H2O(l) ΔH1＝-1301.0 kJ?mol-1
② C(s)+ O2(g) == CO2(g) △H2＝-393.5 kJ?mol-1
③ H2(g)+ 
O2(g) == H2O(1) △H3 =" -285.8" kJ·mol-1
则反应④ 2C(s)+ H2(g) == C2H2(g)的△H为（ ）
| A．+228.2 kJ·mol-1 | B．-228.2 kJ·mol-1 |
| C．+1301.0 kJ·mol-1 | D．+621.7 kJ·mol-1 |
已知热化学方程式：
① C2H2(g) +
O2(g) == 2CO2(g)＋H2O(l) ΔH1＝-1301.0 kJ?mol-1
② C(s)+ O2(g) == CO2(g) △H2＝-393.5 kJ?mol-1
③ H2(g)+
O2(g) == H2O(1) △H3 =" -285.8" kJ·mol-1
则反应④ 2C(s)+ H2(g) == C2H2(g)的△H为（ ）
① C2H2(g) +
O2(g) == 2CO2(g)＋H2O(l) ΔH1＝-1301.0 kJ?mol-1② C(s)+ O2(g) == CO2(g) △H2＝-393.5 kJ?mol-1
③ H2(g)+
O2(g) == H2O(1) △H3 =" -285.8" kJ·mol-1则反应④ 2C(s)+ H2(g) == C2H2(g)的△H为（ ）
| A．+228.2 kJ·mol-1 | B．-228.2 kJ·mol-1 |
| C．+1301.0 kJ·mol-1 | D．+621.7 kJ·mol-1 |
已知热化学方程式：
① C2H2(g) +
O2(g) ="=" 2CO2(g)＋H2O(l) ΔH1＝-1301.0 kJ?mol-1
② C(s)+ O2(g) ="=" CO2(g) △H2＝-393.5 kJ?mol-1
③ H2(g)+ O2(g) ="=" H2O(1) △H3 =" -285.8" kJ·mol-1
则反应④ 2C(s)+ H2(g) ="=" C2H2(g)的△H为
① C2H2(g) +
O2(g) ="=" 2CO2(g)＋H2O(l) ΔH1＝-1301.0 kJ?mol-1② C(s)+ O2(g) ="=" CO2(g) △H2＝-393.5 kJ?mol-1
③ H2(g)+ O2(g) ="=" H2O(1) △H3 =" -285.8" kJ·mol-1
则反应④ 2C(s)+ H2(g) ="=" C2H2(g)的△H为
| A．+228.2 kJ·mol-1 | B．-228.2 kJ·mol-1 |
| C．+1301.0 kJ·mol-1 | D．+621.7 kJ·mol-1 |
已知热化学方程式：
① C2H2(g) +
O2(g) ="=" 2CO2(g)＋H2O(l) ΔH1＝-1301.0 kJ?mol-1
② C(s)+ O2(g) ="=" CO2(g) △H2＝-393.5 kJ?mol-1
③ H2(g)+ O2(g) ="=" H2O(1) △H3 =" -285.8" kJ·mol-1
则反应④ 2C(s)+ H2(g) ="=" C2H2(g)的△H为
| A．+228.2 kJ·mol-1 | B．-228.2 kJ·mol-1 |
| C．+1301.0 kJ·mol-1 | D．+621.7 kJ·mol-1 |