Chapter 6, Problem 6.110P

Interpretation Introduction

(a)

Interpretation:

The molar mass of riboflavin should be determined.

Concept Introduction:

The molar mass can be obtained via colligative property experiments. When a salt is mixed to a solvent such as water, the freezing point is depressed according to the colligative properties of the solution.

The mathematical expression is given as follows:

$T_{\text{F}-m\text{i}\text{X}}=T_{\text{F}-pur\text{e}}-K_{\text{F}}m(\text{i})$

Where,

$T_{\text{F}-m\text{i}\text{X}}$: freezing point of mixture.

$T_{\text{F}-pur\text{e}}$: Freezing point of pure component.

$K_{\text{F}}$ = Freezing point constant for water.

$m$ =molality.

$\text{i}$ =ions in solution.

Interpretation Introduction

(b)

Interpretation:

The molecular structure should be completed.

Concept Introduction:

The skeletal structure is used to ensure description of the molecules.