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
高二化学选择题中等难度题
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
高二化学选择题简单题查看答案及解析
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
高二化学选择题简单题查看答案及解析
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
高二化学选择题简单题查看答案及解析
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
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
高二化学单选题简单题查看答案及解析
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
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
高二化学选择题中等难度题查看答案及解析
已知在25 ℃、101 kPa下,1 g C8H18(辛烷)燃烧生成二氧化碳和液态水放出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(l)ΔH=-48.40kJ·mol-1
B.C8H18(l)+O2(g)=8CO2(g)+9H2O(l)ΔH=-5518kJ·mol-1
C.C8H18(l)+O2(g)=8CO2(g)+9H2O(l)ΔH=+5518kJ·mol-1
D.C8H18(l)+O2(g)=8CO2(g)+9H2O(l)ΔH=+48.40kJ·mol-1
高二化学选择题中等难度题查看答案及解析
已知在25℃,101kPa下,1g液态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(1)+22.5O2(g)=8CO2(g)+9H2O(g)ΔH=-48.40kJ·mol-1
B. C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1)ΔH=-5518kJ·mol-1
C. C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(1)ΔH=-5518kJ
D. C8H18(1)+22.5O2(g)=8CO2(g)+9H2O(g)ΔH=-5518kJ·mol-1
高二化学单选题简单题查看答案及解析
已知在25 ℃、101 kPa下,1 g C8H18(辛烷)燃烧生成二氧化碳和液态水放出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(l) ΔH=-48.40 kJ·mol-1
B. C8H18(l) + O2(g)8CO2(g) + 9H2O(l) ΔH=-5 518 kJ·mol-1
C. C8H18(l) + O2(g)8CO2(g) + 9H2O(l) ΔH=+5 518 kJ·mol-1
D. C8H18(l) + O2(g)8CO2(g) + 9H2O(l) ΔH=+48.40 kJ·mol-1
高二化学单选题简单题查看答案及解析
已知在25℃,101kPa下,l g 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(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
高二化学选择题中等难度题查看答案及解析
已知在25 ℃、101 kPa下,1 g C8H18(辛烷)燃烧生成二氧化碳和液态水时放出48.40 kJ的热量。表示辛烷燃烧热的热化学方程式正确的是( )
A.2C8H18(l) +25O2(g)===16CO2(g)+18H2O(g) ΔH=-11035.2 kJ·mol-1
B.C8H18(l) +O2(g) ===8CO2(g)+9H2O(l) ΔH=-5517.6 kJ·mol-1
C.C8H18(l) +O2(g) ===8CO2(g)+9H2O(l) ΔH=—11035.2kJ·mol-1
D.2C8H18(l) +25O2(g) ===16CO2(g)+18H2O(l) ΔH=-5517.6 kJ·mol-1
高二化学单选题中等难度题查看答案及解析