delta T = i*Kf*m
Since Kf and m are the same for all of these it will depend upon i, the van't Hoff factor.
i = 4 for Na3PO4
i = 3 for Li2CO3.
i = 2 for NH4Cl
i = 5 for Sn(NO3)4
Assuming equal concentration rank these by freezing points, Na3PO4, Li2Co3,NH4Cl, and Sn(NO3)4
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