题目列表(包括答案和解析)
已知在25℃,101KPa下,1g 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(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
已知在25℃,101KPa下,1g 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(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
已知在25℃,101KPa下,1g 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(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
已知在25℃,101KPa下,1g 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.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
已知在25℃,101KPa下,1g 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(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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