Determine molality and the change in temp if know those can, Chemistry

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Determine molality and the change in temp if know those can

An aqueous solution of NaCl freezes at -1.6 deg C. At what temperature will it boil? Given that Kb for water is 0.52 deg m-1.

How do I determine molality and the change in temp? If I know those can I plug them into the same equation: change in temp = iKfm

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