8.氢气.一氧化碳.辛烷.甲烷的热化学方程式分别为: H2(g)+1/2O2(g)=H2O(l) △H=-285.8kJ/mol CO(g)+1/2O2(g)=CO2(g) △H=-283.0kJ/mol C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(l) △H=-5518kJ/mol CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-89.3kJ/mol 相同质量的氢气.一氧化碳.辛烷.甲烷完全燃烧时.放出热量最多的是( ) A.H2 C.C8H18(l) D.CH4(g) 查看更多

 

题目列表(包括答案和解析)

氢气、一氧化碳、辛烷、甲烷的热化学方程式分别为:?

H2(g)+1/2O2(g) H2O(l) ΔH=-285.8 kJ·mol-1??

CO(g)+1/2O2(g) CO2(g) ΔH=-283.0 kJ·mol-1??

C8H18(l)+25/2O2(g) 8CO2(g)+9H2O(l) ΔH=-5 518 kJ·mol-1??

CH4(g)+2O2(g) CO2(g)+2H2O(l) ΔH=-89.3 kJ·mol-1??

相同质量的氢气、一氧化碳、辛烷、甲烷完全燃烧时,放出热量最少的是(  )?

A.H2(g)                                  B.CO(g)?

C.C8H18(l)                             D.CH4(g)?

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氢气、一氧化碳、辛烷、甲烷的热化学方程式分别为

H2(g)+1/2O2(g)H2O(l);ΔH=-285.8 kJ·mol-1

CO(g)+1/2O2(g)CO2(g);ΔH=-283.0 kJ·mol-1

C8H18(l)+25/2O2(g)8CO2(g)+9H2O(l);ΔH=-5 518 kJ/mol

CH4(g)+2O2(g)CO2(g)+2H2O(l);ΔH=-890.3 kJ·mol-1

相同质量的H2、CO、C8H18、CH4完全燃烧时,放出热量最少的是(    )

A.H2(g)                   B.CO(g)                 C.C8H18(l)                D.CH4(g)

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氢气、一氧化碳、辛烷、甲烷的热化学方程式分别为

H2(g)+1/2O2(g)====H2O(l);

ΔH=-285.8 kJ·mol-1

CO(g)+1/2O2(g)====CO2(g);

ΔH=-283.0 kJ·mol-1

C8H18(l)+25/2O2(g)====8CO2(g)+9H2O(l);

ΔH=-5 518 kJ/mol

CH4(g)+2O2(g)====CO2(g)+2H2O(l);

ΔH=-890.3 kJ·mol-1

相同质量的H2、CO、C8H18、CH4完全燃烧时,放出热量最少的是(    )

A.H2(g)                   B.CO(g)              C.C8H18(l)                D.CH4(g)

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氢气、一氧化碳、辛烷、甲烷的热化学方程式分别为:

H2(g)+1/2O2(g)=H2O(l);             △H=-285.8kJ/mol

CO(g)+1/2O2(g)=CO2(g);            △H=-283.0kJ/mol

C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(l);△H=-5518kJ/mol

CH4(g)+2O2(g)=CO2(g)+2H2O(l);    △H=-89.3kJ/mol

相同质量的氢气、一氧化碳、辛烷、甲烷完全燃烧时,放出热量最少的是(    )

A. H2(g)    B. CO(g)    C. C8H18(l)    D. CH4(g)

 

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氢气、一氧化碳、辛烷、甲烷的热化学方程式分别为:

H2(g)+1/2O2(g)=H2O(l);              △H=-285.8 kJ / mol

CO(g)+1/2O2(g)=CO2(g);             △H=-283.0 kJ / mol

C8H18(l)+25/2O2(g)=8CO2(g)+9H2O(l); △H=-5518 kJ / mol

CH4(g)+2O2(g)=CO2(g)+2H2O(l);      △H=-890.3 kJ / mol

相同质量的氢气、一氧化碳、辛烷、甲烷完全燃烧时,放出热量最少的是

A. H2(g)      B. CO(g)      C. C8H18(l)      D.CH4(g)

 

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