甲醇是一种重要的化工原料，广泛应用于化工生产，也可直接用作燃料。已知：
CH3OH(l)+O2(g)
CO(g)+2H2O(g) 
；
2CO(g)+O2(g)2CO2(g) 
。
下列说法或热化学方程式正确的是
A．CO的燃烧热为 |
| B．2 mol CO和1 mol O2的总能量比2 mol CO2的总能量低 |
C．2CH3OH(l)+3O2(g)2CO2(g)+4H2O(g)  |
| D．完全燃烧16g甲醇，生成一氧化碳和水时放出的热量为221.82 kJ |
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