已知下列热化学方程式:(1)CH3COOH(l)+2O2(g) === 2CO2(g)+2H2O(l)    △H1=

已知下列热化学方程式:

(1)CH3COOH(l)+2O2(g) === 2CO2(g)+2H2O(l)    △H1= -870.3kJ·mol-1

(2)C(s)+O2(g) === CO2(g)                     △H2= -393.5 kJ·mol-1

(3)H2(g)+O2(g) ===  H2O(l)                   H3= -285.8 kJ·mol-1

则反应2C(s)+2H2(g)+O2(g)===CH3COOH(l) 的焓变△H为(    )kJ·mol-1

A.488.3       B.-244.15         C.244.15        D.-488.3

 

答案

D

解析:(2)×2 +(3)×2-(1)得2C(s)+2H2(g)+O2(g)===CH3COOH(l)

2△H2+ 2△H3—△H1=(-393.5kJ·mol-1 )×2+(-285.8kJ·mol-1)×2-

(-870.3 kJ·mol-1)=-488.3 kJ·mol-1

 

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