— Mum, I won first place in the competition. — ________________ A. That’s all right. B. Really? You are lucky. C. You must be joking! D. Congratulations on your success. 答案:D已知乙炔与苯蒸汽完全燃烧的热化学方程式如下所示:①C2H2(g)+5/2O2(g)→2CO2(g)+H2O(1) △H=-1300KJ/mol②C6H6(g)+15/2O2(g)→6CO2(g)+3H2O(1)△H=-3295Kj/mol下列说法正确的是 ( )A.1mol C2H2(g)完全燃烧生成气态水时放热大于1300kJB.1mol C6H6(1)完全燃烧生成液态水时放热大于3295kJC.相同条件下,等质量的C2H2(g)与C6H6(g)完全燃烧,C6H6(g)放热更多D.C2H2(g)三聚生成C6H6(g)的过程属于放热反应