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例1(2011年桂林)一定条件下,一定量的化合物A和O2恰好完全反应,生成44g CO2和9 g H2O,则A物质的相对分子质量不可能是A.26 B.40 C.58 D.90
Under certain conditions (Guilin, 2011), a certain amount of compound A and O2 exactly reacted exactly to produce 44 g CO2 and 9 g H2O, the relative molecular mass of substance A could not be A.26 B. 40 C.58 D .90