常温常压下,充分燃烧一定量的甲烷放出热量222.575KJ,经测定完全吸收生成的二氧化碳需消耗1mol/L的NaOH溶液250mL,恰好生成正盐。则此条件下甲烷的燃烧热热化学方程式 ( )
A.CH4(g)+2O2(g)=CO2(g)+2H2O(g);△H="-890.3" kJ/mol |
B.1/2CH4(g)+O2(g)=1/2CO2(g)+H2O(l);△H="-222.575" kJ/mol |
C.1/2CH4(g)+O2(g)=1/2CO2(g)+H2O(g);△H="-445.15" kJ/mol |
D.CH4(g)+2O2(g)=CO2(g)+2H2O(l);△H="-890.3" kJ/mol |