\(m{CO}\)、\(m{H_{2}}\)、\(m{C_{2}H_{5}OH}\)三种物质燃烧的热化学方程式如下： \(m{①CO(g)+1/2O_{2}(g)=CO_{2}(g)}\)\(m{ΔH_{1}=a kJ/mol}\) \(m{②H_{2}(g)+1/2O_{2}(g)=H_{2}O(g)}\)\(m{ΔH_{2}=bkJ/mol}\) \(m{③C_{2}H_{5}OH(l)+3O_{2}(g)=2CO_{2}(g)+3H_{2}O(g)}\)\(m{ΔH

\(\rm{CO}\)、\(\rm{H_{2}}\)、\(\rm{C_{2}H_{5}OH}\)三种物质燃烧的热化学方程式如下：

\(\rm{①CO(g)+1/2O_{2}(g)=CO_{2}(g)}\) \(\rm{ΔH_{1}=a kJ/mol}\)

\(\rm{②H_{2}(g)+1/2O_{2}(g)=H_{2}O(g)}\) \(\rm{ΔH_{2}=bkJ/mol}\)

\(\rm{③C_{2}H_{5}OH(l)+3O_{2}(g)=2CO_{2}(g)+3H_{2}O(g)}\) \(\rm{ΔH_{3}=ckJ/mol}\)

下列说法正确的是( )

A．\(\rm{ΔH_{1} > 0}\)

B．\(\rm{2H_{2}O(l)=2H_{2}(g)+O_{2}(g)}\) \(\rm{ΔH= }\)--\(\rm{2bkJ/mol}\)

C．\(\rm{CO_{2}}\)与\(\rm{H_{2}}\)合成\(\rm{C_{2}H_{5}OH}\)反应的原子利用率为\(\rm{100\%}\)

D．\(\rm{2CO(g)+4H_{2}(g)=H_{2}O(g)+C_{2}H_{5}OH(1)}\) \(\rm{ΔH=(2a+4b-c)kJ/mol}\)

【考点】热化学方程式,反应热和焓变,用盖斯定律及有关计算

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难度：易