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        1. 4.已知在25℃.101kPa下.lgC8H18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(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

           

          題目列表(包括答案和解析)

          已知在25℃,101kPa下,lgC8H18(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(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

          查看答案和解析>>

          已知在25℃,101kPa下,lgC8H18(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(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

          查看答案和解析>>

          已知在25℃,101kPa下,lgC8H18(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(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,相對分子質(zhì)量為114)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(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

           

          查看答案和解析>>

          已知在25℃,101kPa下,lgC8H18(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(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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