Which solution has the lowest vapor pressure?

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(D) The lowering of vapor pressure is directly proportional to the van't Hoff factor $(i)$ multiplied by the molar concentration $(C)$.For a given con

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$0.1 \, M \, Na_3PO_4$

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(D) The lowering of vapor pressure is directly proportional to the van't Hoff factor $(i)$ multiplied by the molar concentration $(C)$.For a given concentration,the solution with the highest van't Hoff factor $(i)$ will have the greatest lowering of vapor pressure,and thus the lowest vapor pressure.$i$ values are as follows:$BaCl_2 ightarrow Ba^{2+} + 2Cl^-$,$i = 3$$	ext{Urea} ightarrow 	ext{non-electrolyte}$,$i = 1$$Na_2SO_4 ightarrow 2Na^+ + SO_4^{2-}$,$i = 3$$Na_3PO_4 ightarrow 3Na^+ + PO_4^{3-}$,$i = 4$Since $Na_3PO_4$ has the highest $i$ value $(i=4)$,it causes the maximum lowering of vapor pressure,resulting in the lowest vapor pressure.

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