Question

What is the boiling point of a 0.743 m aqueous solution of `KCl`?

Answer 1

Well, what is the `"molal boiling point elevation constant"` of water?

Explanation:

I don't know offhand, but it would have been supplied with the question.

And note that the `"molal boiling point elevation constant"` relates to the number of particles in solution...a `0.743*mol*kg^-1` solution is `1.486*mol*kg^-1` with respect to sodium ions, AND chloride ions....i.e. sodium chloride speciates in aqueous solution.