A solution made from .650g of an unknown compound in 27.8 g of diphenyl gave a freezing-point depression of 1.56 degrees C. Calculate the molality of the solution. (Kf for diphenyl is 8 degrees C/m)
delta T = Kf*molality
delta T = Kf x M x i
we have i =1 ..1 particle
Kf = 8
delta T =1.56
so m = delta T / Kf x i
= 1.56 / 8
= 0.195 m
To calculate the molality of the solution, we need to first find the number of moles of the solute and the mass of the solvent.
Step 1: Calculate the number of moles of the solute.
We can do this by dividing the mass of the unknown compound by its molar mass.
Given:
Mass of unknown compound (solute) = 0.650g
To find the molar mass of the unknown compound, we need its chemical formula. Unfortunately, it is not provided in the given information. Therefore, we cannot calculate the molar mass and the number of moles.
Please provide the chemical formula of the unknown compound to continue with the calculation of the molality.