第17题 two aqueous solution are prepared:2.0m Cu(NO3)2 2.0m NaBr which statement is true? (A) Cu(NO3)2 solution has higher vapor pressure and lower freezing point than NaBr solution (B) Cu(NO3)2 solution has higher vapor pressure and higher freezing point than NaBr solution (C) Cu(NO3)2 solution has lower vapor pressure and lower freezing point than NaBr solution (D) Cu(NO3)2 solution has lower vapor pressure and higher freezing point than NaBr solution 依照熔点下降的公式来看，可以确定B D是错的 那A C要怎麽判断才好? 蒸气压下降， 是只要照着公式 △P= i x (纯溶剂的蒸气压) x (溶质的莫耳分率) 考量嘛? --

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