在25℃,101 k P的条件下,5.2 g C2H2完全燃烧生成CO2和H2O(l)时放出259.92 kJ热量。表示上述反应的热化学方程式正确的是
A.1/5C2H2(g)+1/2O2(g)=2/5CO2(g)+1/5H2O(l) △H=+259.92 kJ/mol |
B.0.2C2H2(g)+0.5O2(g)=0.4CO2(g)+0.2H2O(l) △H=-259.92 kJ/mol |
C.2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l) △H=+2599.2 kJ/mol |
D.2C2H2(g)+5O2(g)=4CO2(g)+2H2O(g) △H=-2599.2 kJ/mol |