A solution is prepared by dissolving 0.131 g of a molecular substance in 25.4 g of water. The molality of the solution is determined by freezing point depression to be 0.056 m. What is the molecular mass of the substance?

the answer is na (sodium)

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.