8.已知在25oC.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(l)+25eq \o(\s\up 3(-O2(g)= 8CO2(g)+9H2O(g),ΔH = -48.40kJ/mol B.C8H18(l)+25eq \o(\s\up 3(-O2(g)= 8CO2(g)+9H2O(l),ΔH = -5518kJ/mol C.C8H18(l)+25eq \o(\s\up 3(-O2(g)= 8CO2(g)+9H2O(l),ΔH = +5518kJ/mol D.C8H18(l)+25eq \o(\s\up 3(-O2(g)= 8CO2(g)+9H2O(l),ΔH = -48.40kJ/mol 查看更多

 

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已知在25oC,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)+O2(g)= 8CO2(g)+9H2O(g);ΔH = -48.40kJ/mol

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

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

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

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