A student in chemistry has a 7.21 m solution that raised the boiling point of the solution by 1.25 degrees C. What is the molal boiling point constant (Kb) of the solution?

Answer 1

∆T = imK

∆T = change in boiling point = 1.25º

i = van't Hoff factor = 1 (since no info on what the solute is, we assume i = 1)

m = molality = 7.21 m

K = boiling constant = ?

1.25 = (1)(7.21)(K)

K = 0.173 ºC/m