第17題 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 依照熔點下降的公式來看，可以確定B D是錯的 那A C要怎麼判斷才好? 蒸氣壓下降， 是只要照著公式 △P= i x (純溶劑的蒸氣壓) x (溶質的莫耳分率) 考量嘛? --

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