Given 2.00m aqueous solution of NH3, AlCl3, MgCl2 and KCl, put in order of vapor pressure lowest to highest. All solutions are at the same temperature.
Lowest
Next
Next
Highest

George: I think you will find the answer to this question in the COLLIGATIVE PROPERTIES chapter of your textbook. Ask back if you need more help; the answer should be pretty apparent once you have read the book.