12.已知在25℃.101kPa下.lgC8H18燃烧生成二氧化碳和液态水时放出48.40kJ热量.表示上述反应的热化学方程式正确的是 ( ) A.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(g),△H=-48.40kJ·mol-1 B.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1),△H=-5518kJ·mol-1 C.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1),△H=+5518kJ·mol-1 D.C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1),△H=-48.40kJ·mol-1 查看更多

 

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已知在25℃,101kPa下,lgC8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40kJ热量.表示上述反应的热化学方程式正确的是

[  ]

A.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(g);△H=-48.40kJ·mol-1

B.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1);△H=-5518kJ·mol-1

C.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1);△H=+5518kJ·mol-1

D.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1);△H=-48.40kJ·mol-1

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已知在25℃,101kPa下,lgC8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40kJ热量.表示上述反应的热化学方程式正确的是

[  ]

A.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(g);△H=-48.40kJ·mol-1

B.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1);△H=-5518kJ·mol-1

C.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1);△H=+5518kJ·mol-1

D.

C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1);△H=-48.40kJ·mol-1

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已知在25℃,101kPa下,lgC8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40kJ热量。表示上述反应的热化学方程式正确的是

A.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(g) ∆H=-48.40kJ/mol

B.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ∆H=-5518kJ/mol

C.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ∆H=+5518kJ/mol

D.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ∆H=-48.40kJ/mol

 

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已知在25℃,101kPa下,lgC8H18(辛烷,相对分子质量为114)燃烧生成二氧化碳和液态水时放出48.40kJ热量。表示上述反应的热化学方程式正确的是(    )

A.C8H18(1)+ 25/2O2(g)=8CO2(g)+9H2O(1) △H=-5517.6kJ·mol-1

B.C8H18(1)+ 25/2O2(g)=8CO2(g)+9H2O(1) △H=+5517.6kJ·mol-1

C.C8H18(1)+ 25/2O2(g)=8CO2(g)+9H2O(g) △H=-48.40kJ·mol-1

D.C8H18(1)+ 25/2O2(g)=8CO2(g)+9H2O(1) △H=-48.40kJ·mol-1

 

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已知在25℃,101kPa下,lgC8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40kJ热量。表示上述反应的热化学方程式正确的是

A.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(g) ?H=-48.40kJ/mol
B.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ?H=-5518kJ/mol
C.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ?H=+5518kJ/mol
D.C8H18(1)+12.5O2(g)=8CO2(g)+9H2O(1) ?H=-48.40kJ/mol

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