This is what you need to do.
First, use delta T = i*Kb*m and solve for m. i = 2 for NaCl and you have the other numbers in the problem.
Convert molality to percent by mass. Post your work if you get stuck.
The boiling point of water at 735 mmHg is 99.07C. What percent by mass of NaCl should be present in a water soln to raise the boiling point to 100.0C? [Kb for water is 0.512 C kg solvent (mol solute )-1]
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