3.已知下列反應(yīng)的熱化學(xué)方程式為 : +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)+O2(g)===H2O(l) ΔH3=-285.8 kJ/mol 則2C(s)+2H2(g)+O2(g)===CH3COOH為 ( ) A.488.3 kJ/mol B.-488.3 kJ/mol C.-244.15kJ/mol D.244.15kJ/mol 解析:據(jù)蓋斯定律知即得 2C(s)+2H2(g)+O2(g)===CH3COOH(l) 方程式的反應(yīng)熱 ΔH=×2+×2-=-488.3 kJ/mol 答案:B 查看更多

 

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已知下列反應(yīng)的熱化學(xué)方程式為:

①C(s)+O2(g)=CO2(g);                △H1=—393.5kJ/mol    

②CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l);△H2=—870.3kJ/mol  

③H2(g)+1/2 O2(g)=H2O(l);           △H3=—285.8kJ/mol  

 則反應(yīng)2C(s)+2H2(g)+O2(g)=CH3COOH(l)的△H為

A.+488.3kJ/mol                        B.—488.3 kJ/mol  

C.—244.15 kJ/mol                     D.+244.15 kJ/mol

 

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已知下列反應(yīng)的熱化學(xué)方程式為:
①C(s)+O2(g)=CO2(g);               △H1=—393.5kJ/mol    
②CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l);△H2=—870.3kJ/mol  
③H2(g)+1/2 O2(g)=H2O(l);          △H3=—285.8kJ/mol  
則反應(yīng)2C(s)+2H2(g)+O2(g)=CH3COOH(l)的△H為
A.+488.3kJ/molB.—488.3 kJ/mol
C.—244.15 kJ/molD.+244.15 kJ/mol

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已知下列反應(yīng)的熱化學(xué)方程式為:

①C(s)+O2(g)=CO2(g);                △H1=—393.5kJ/mol     

②CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l);△H2=—870.3kJ/mol  

③H2(g)+1/2 O2(g)=H2O(l);           △H3=—285.8kJ/mol  

 則反應(yīng)2C(s)+2H2(g)+O2(g)=CH3COOH(l)的△H為    (      )

A.+488.3kJ/mol                        B.—488.3 kJ/mol  

C.—244.15 kJ/mol                     D.+244.15 kJ/mol

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已知下列反應(yīng)的熱化學(xué)方程式為:

①C(s)+O2(g)=CO2(g);               △H1=—393.5kJ/mol    

②CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l);△H2=—870.3kJ/mol  

③H2(g)+1/2 O2(g)=H2O(l);          △H3=—285.8kJ/mol  

 則反應(yīng)2C(s)+2H2(g)+O2(g)=CH3COOH(l)的△H為

A.+488.3kJ/mol                       B.—488.3 kJ/mol  

C.—244.15kJ/mol                     D.+244.15 kJ/mol

 

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已知下列反應(yīng)的熱化學(xué)方程式為:
①C(s)+O2(g)=CO2(g);               △H1=—393.5kJ/mol    
②CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l);△H2=—870.3kJ/mol  
③H2(g)+1/2 O2(g)=H2O(l);          △H3=—285.8kJ/mol  
則反應(yīng)2C(s)+2H2(g)+O2(g)=CH3COOH(l)的△H為

A.+488.3kJ/molB.—488.3 kJ/mol
C.—244.15 kJ/molD.+244.15 kJ/mol

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