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 查看更多

 

题目列表(包括答案和解析)

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

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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-1B.-228.2 kJ·mol-1
C.+1301.0 kJ·mol-1D.+621.7 kJ·mol-1

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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-1B.-228.2 kJ·mol-1
C.+1301.0 kJ·mol-1D.+621.7 kJ·mol-1

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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-1B.-228.2 kJ·mol-1
C.+1301.0 kJ·mol-1D.+621.7 kJ·mol-1

查看答案和解析>>

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-1B.-228.2 kJ·mol-1
C.+1301.0 kJ·mol-1D.+621.7 kJ·mol-1

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