Chapter 4, Problem 4F.15E

(a)

Interpretation Introduction

Interpretation:

The boiling point of dimethyl ether has to be estimated.

Concept Introduction:

Trouton’s Rule:

Trouton’s rule states that for many liquids, the entropy of vaporization is approximately the same at $\approx \text{85}\text{J}{\text{mol}}^{\text{-1}}{\text{K}}^{\text{-1}}\text{.}$

The formula is,

  ${\text{ΔS}}_{\text{vap}}\text{=}\frac{{\text{ΔH}}_{\text{vap}}}{\text{T}}$

The value of ${\text{ΔS}}_{\text{vap}}$ is found to be $\sim \text{85}\text{J}{\text{mol}}^{\text{-1}}{\text{K}}^{\text{-1}}$ approximately at the boiling point.

(b)

Interpretation Introduction

Interpretation:

The actual boiling point of dimethyl ether has to be given.  The difference in the actual boiling point of dimethyl ether and boiling point of dimethyl ether calculated from Trouton’s rule has to be compared and explained.