Say, we have 1 molar solution of $\ce{NaCl}$ and 1 molal solution of $\ce{NaCl}$. Among these, which will have maximum vapour pressure?

I know that vapour pressure will depend on the number of $\ce{Na+}$ and $\ce{Cl-}$ ions, but how do we determine which has greater amount? Like one is 1 mol in 1 L while other is in 1 kg.

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    $\begingroup$ You need to use the density of water at the same temperature to determine the conversion factor between molality and molarity. $\endgroup$ – Buck Thorn May 20 at 9:49

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