9.已知在25℃.101KPa下.1g C8H18燃燒生成二氧化碳和液態(tài)水時放出48.40KJ熱量.表示上述反應(yīng)的熱化學(xué)方程式正確的是 A.C8H18== 8CO2 ΔH=-48.40KJ/mol B.C8H18== 8CO2 ΔH=-5518KJ/mol C.C8H18== 8CO2 ΔH=+5518KJ/mol D.C8H18== 8CO2 ΔH=-48.40KJ/mol 查看更多

 

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已知在25℃,101KPa下,1g C8H18(辛烷)燃燒生成二氧化碳和液態(tài)水時放出48.40KJ熱量。表示上述反應(yīng)的熱化學(xué)方程式正確的是                 

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)燃燒生成二氧化碳和液態(tài)水時放出48.40KJ熱量。表示上述反應(yīng)的熱化學(xué)方程式正確的是(  )

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)燃燒生成二氧化碳和液態(tài)水時放出48.40KJ熱量。表示上述反應(yīng)的熱化學(xué)方程式正確的是

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)燃燒生成二氧化碳和液態(tài)水時放出48.40kJ熱量。表示上述反應(yīng)的熱化學(xué)方程式正確的是                 

A.2C8H18(l)+25O2(g)== 16CO2(g) + 18H2O(g);ΔH=-96.80 kJ/mol

B.2C8H18(l)+25O2(g)== 16CO2(g) + 18H2O(l);ΔH=-11036 kJ/mol

C.2C8H18(l)+25O2(g)==16CO2(g) + 18H2O(l);ΔH=+11036 kJ/mol

D.2C8H18(l)+25O2(g)== 16CO2(g) + 18H2O(l);ΔH=-96.80 kJ/mol

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已知在25℃,101KPa下,1g C8H18(辛烷)燃燒生成二氧化碳和液態(tài)水時放出48.40KJ熱量。表示上述反應(yīng)的熱化學(xué)方程式正確的是                 

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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