1.
(2016高一上·浦东期末)
在25℃,101kPa下,0.1molC2H2完全燃烧生成CO2和H2O(I)时放出129.96kJ热量.表示上述反应的热化学方程式正确的是( )
A . 2C2H2(g)+5O2(g)→4CO2(g)+2H2O(l)+129.96kJ
B . 2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)﹣259.92kJ
C . 2C2H2(g)+5O2(g)→4CO2(g)+2H2O(l)﹣1299.6kJ
D . 2C2H2(g)+5O2(g)→4CO2(g)+2H2O(l)+2599.2kJ