13.已知在25℃.101Kpa下.1g 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(l)+12.5O2(g)=8CO2(g)+9H2O(g),△H=-48.40kJ·mol-1 B.C8H18(l)+12.5 O2(g)=8CO2(g)+9H2O(l),△H=-5517.6kJ·mol-1 C.C8H18(l)+12.5 O2(g)=8CO2(g)+9H2O(l),△H=+5517.6kJ·mol-1 D.C8H18(l)+12.5 O2(g)=8CO2(g)+9H2O(l),△H=-48.40kJ·mol-1 查看更多

 

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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
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A.C8H18(l)+O2(g)=8CO2(g)+ 9H2O(g);ΔH = - 48.40 kJ·mol-1
B.C8H18(l)+O2(g)=8CO2(g)+ 9H2O(l);ΔH = - 5518 kJ·mol-1
C.C8H18(l)+O2(g)=8CO2(g)+ 9H2O(l);ΔH = + 5518 kJ·mol-1
D.C8H18(l)+O2(g)=8CO2(g)+ 9H2O(l);ΔH = - 48.40 kJ·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48.40 kJ热量。表示上述反应的热化学方程式正确的是

A.C8H18(l)+ O2(g)=8CO2(g)+ 9H2O(g);ΔH = - 48.40 kJ?mol-1

B.C8H18(l)+O2(g)=8CO2(g)+ 9H2O(l);ΔH = - 5518 kJ?mol-1

C.C8H18(l)+ O2(g)=8CO2(g)+ 9H2O(l);ΔH = + 5518 kJ?mol-1

D .C8H18(l)+O2(g)=8CO2(g)+ 9H2O(l);ΔH = - 48.40 kJ?mol-1

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