Chapter 12, Problem 12.95QE

(a)

Interpretation Introduction

Interpretation:

The molar mass of the red solid has to be calculated.

Concept Introduction:

Freezing point depression:  The freezing point depression is proportional to the concentration of the solute particles and is given by the equation,

  ${\text{ΔT}}_{\text{f}}{\text{=imk}}_{\text{f}}$

Here,

  ${\text{ΔT}}_{\text{f}}\text{=}$ Freezing point of the solution

  $\text{m=}$ Molal concentration

  ${\text{k}}_{\text{f}}\text{=}$ Freezing point depression constant (depends on the solvent used).

  $\text{i=}$ van’t Hoff factor

(b)

Interpretation Introduction

Interpretation:

The number of iron atoms in each molecule of the solute has to be calculated.