Answer to Question #157765 in General Chemistry for Kit

Question

Assume you have 7.21 m solution that raised the boiling point of the solution by 1.25°C. What is the molal boiling point constant (Kb) for the solution?

Answer 1

We know the formula, ∆T = k_f m

Where, ∆T = boiling point elevation constant(K)

= 1.25°C

= 1.25 K (as Kelvin and celcius scale have same interval)

k_f = molal boiling point elevation constant

m = molality of the solution

So, from the above equation,

k_f = ∆T/m

= 1.25/7.21

=0.1734 K.kg.mol^-1

Hence the required answer is = 0.1734 K.kg.mol-1