下面均是正丁烷与氧气反应的热化学方程式(25℃、101kPa): ①C4H10(g)+O2(g)═4CO2(g)+5H2O(l);△H=-2 878kJ-mol-1 ②C4H10(g)+O2(g)═4CO2(g)+5H2O(g);△H=-2 658kJ-mol-1 ③C4H10(g)+O2(g)═4CO(g)+5H2O(l);△H=-1 746kJ-mol-1 ④C4H10(g)+O2(g)═4CO(g)+5H2O(g);△H=-1 526kJ-mol-1 由此判断,正丁烷的燃烧热为( )A.-2878 kJ/mol | B.-2 658kJ/mol | C.-1746 kJ/mol | D.-1526 kJ/mol |
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