下列热化学方程式书写正确的是(的绝对值均正确)A.S(s)+O2(g

下列热化学方程式书写正确的是(的绝对值均正确)

A.S(s)+O2(g)===SO2(g);△H=—269.8kJ/mol(反应热)

B. NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H=+57.3kJ/mol(中和热)

C. C2H5OH(l)+3O2(g)==2CO2(g)+3H2O(g);△H=—1367.0 kJ/mol(燃烧热)

D. 2H2O==O2+2H2;△H=+571.6kJ/mol(反应热)

 

答案

A

解析:中和反应是放热反应,△H小于0,B不正确。燃烧热是指在一定条件下,1mol可燃物完全燃烧生成稳定的氧化物时所放出的热量,水对应的稳定状态应是液态,而不是气态,C不正确。D中没有注明物质的状态,不正确。答案选A。

 

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