题目内容
已知下列反应的热化学方程式为 :
(1)C(s)+O2(g)===CO2(g) ΔH1=-393.5 kJ/mol
(2)CH3COOH(l)+2O2(g)→2CO2(g)+2H2O(l) ΔH2=-870.3 kJ/mol
(3)H2(g)+1/2O2(g)===H2O(l) ΔH3=-285.8 kJ/mol
则2C(s)+2H2(g)+O2(g)===CH3COOH(l)的反应热(焓变)为
(1)C(s)+O2(g)===CO2(g) ΔH1=-393.5 kJ/mol
(2)CH3COOH(l)+2O2(g)→2CO2(g)+2H2O(l) ΔH2=-870.3 kJ/mol
(3)H2(g)+1/2O2(g)===H2O(l) ΔH3=-285.8 kJ/mol
则2C(s)+2H2(g)+O2(g)===CH3COOH(l)的反应热(焓变)为
[ ]
A.488.3 kJ/mol
B.-488.3 kJ/mol
C.-244.15kJ/mol
D.244.15kJ/mol
B.-488.3 kJ/mol
C.-244.15kJ/mol
D.244.15kJ/mol
B
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相关题目
已知下列反应的热化学方程式为:
(1)C(s)+O2(g)=CO2(g)△H1=-393.5kJ/mol
(2)CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l)△H2=-870.3kJ/mol
(3)H2(g)+
O2(g)=H2O(l)△H3=-285.8kJ/mol
则反应2C(s)+2H2(g)+O2(g)=CH3COOH(l) 的反应热(焓变)为( )
(1)C(s)+O2(g)=CO2(g)△H1=-393.5kJ/mol
(2)CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l)△H2=-870.3kJ/mol
(3)H2(g)+
1 |
2 |
则反应2C(s)+2H2(g)+O2(g)=CH3COOH(l) 的反应热(焓变)为( )
A、+488.3kJ/mol |
B、-488.3kJ/mol |
C、-244.15kJ/mol |
D、+244.15kJ/mol |