题目

甲烷是一种高效清洁的新能源，0.25 mol甲烷完全燃烧生成液态水时放出222.5 kJ热量，则下列方程式中正确的是 A.2CH4(g)+4O2(g)===2CO2(g)+4H2O(l)  ΔH=+890 kJ·mol－1 B. CH4(g)+2O2(g)===CO2(g)+2H2O(l)  ΔH=+890 kJ·mol－1 C.CH4(g)+2O2(g)===CO2(g)+2H2O(l)  ΔH=－890 kJ·mol－1 D. CH4(g)+2O2(g)===CO2(g)+2H2O(g)  ΔH=－890 kJ·mol－1 答案：CYoung children are often advised not to spoil their appetite by eating sweets ________ the three meals.A．amongB．duringC．betweenD．through