题目

一定质量的无水乙醇完全燃烧时放出的热量为Q，它所生成的CO2用过量饱和石灰水完全吸收可得100gCaCO3沉淀。则完全燃烧1mol无水乙醇时放出的热量是（      ）。A.0.5Q          B.Q         C.2Q         D.5Q 答案：C【试题分析】10、-We’ve spent too much money recently． -Well，it isn’t surprising．Our friends and relatives______ around all the time． A．are coming                             B．had come C．were coming                            D．have been coming