题目列表(包括答案和解析)
已知在25℃,101kPa下,lgC8H18(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(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 |
已知在25℃,101kPa下,lgC8H18(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(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 |
已知在25℃,101kPa下,lgC8H18(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(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
已知在25℃,101kPa下,lgC8H18(辛烷,相对分子质量为114)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)+ 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
已知在25℃,101kPa下,lgC8H18(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(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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