15.已知在25℃.101kPa下.l g C8H18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,l gC8H18(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
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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

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已知在25℃,101KPa下,1g C8H18(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(l)+12.5O2(g)== 8CO2(g) + 9H2O(g)    ΔH= ‒ 48.40KJ/mol

B.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= ‒ 5518KJ/mol

C.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= +5518KJ/mol

D.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= ‒ 48.40KJ/mol

 

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已知在25℃,101KPa下,1g C8H18(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(l)+12.5O2(g)== 8CO2(g) + 9H2O(g)    ΔH= —48.40KJ/mol

B.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)    ΔH= —5518KJ/mol

C.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)    ΔH= +5518KJ/mol

D.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= —48.40KJ/mol

 

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已知在25℃,101KPa下,1g C8H18(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(l)+12.5O2(g)== 8CO2(g) + 9H2O(g)    ΔH= ‒ 48.40KJ/mol

B.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= ‒ 5518KJ/mol

C.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= +5518KJ/mol

   D.C8H18(l)+12.5O2(g)== 8CO2(g) + 9H2O(l)     ΔH= ‒ 48.40KJ/mol

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已知在25℃,101KPa下,1g C8H18(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(l)+12.5O2(g)="=" 8CO2(g)+ 9H2O(g) ΔH= ? 48.40KJ/mol
B.C8H18(l)+12.5O2(g)="=" 8CO2(g)+ 9H2O(l) ΔH= ? 5518KJ/mol
C.C8H18(l)+12.5O2(g)="=" 8CO2(g)+ 9H2O(l) ΔH= +5518KJ/mol
D.C8H18(l)+12.5O2(g)="=" 8CO2(g)+ 9H2O(l) ΔH= ? 48.40KJ/mol

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