題目列表(包括答案和解析)
已知在25℃,101KPa下,1g C8H18(辛烷)燃燒生成二氧化碳和液態(tài)水時(shí)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)+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)燃燒生成二氧化碳和液態(tài)水時(shí)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)+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)燃燒生成二氧化碳和液態(tài)水時(shí)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)+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)燃燒生成二氧化碳和液態(tài)水時(shí)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)+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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