Chapter 3, Problem 3B.6E

(a)

Interpretation Introduction

Interpretation:

The change in entropy of given sample has to be calculated.

Concept Information:

Enthalpy of fusion: The heat is transferred from high to low temperature; at constant pressure, the heat is transferred to per mole of substance at melting temperature, ${\text{T}}_{\text{f}}$ is known as enthalpy of fusion.

Entropy of fusion (at melting point): The change in entropy of per mole of substance at melting temperature is known as entropy of fusion.

${\text{Δ}}_{fusion}\text{S}\text{=}\frac{{\text{Δ}}_{fus}\text{H}\left({\text{T}}_{\text{f}}\right)}{{\text{T}}_{\text{f}}}$

Where,

${\text{Δ}}_{fusion}\text{S}$ is change in entropy of fusion,

${\text{Δ}}_{fus}\text{H}$ is change in enthalpy of fusion,

${\text{T}}_{\text{f}}$ is the melting temperature.

(b)

Interpretation Introduction

Interpretation:

The change in entropy of surrounding has to be calculated.

Concept Information:

Enthalpy of fusion: The heat is transferred from high to low temperature; at constant pressure, the heat is transferred to per mole of substance at melting temperature, ${\text{T}}_{\text{f}}$ is known as enthalpy of fusion.

Entropy of fusion (at melting point): The change in entropy of per mole of substance at melting temperature is known as entropy of fusion.

${\text{Δ}}_{fusion}\text{S}\text{=}\frac{{\text{Δ}}_{fus}\text{H}\left({\text{T}}_{\text{f}}\right)}{{\text{T}}_{\text{f}}}$

Where,

${\text{Δ}}_{fusion}\text{S}$ is change in entropy of fusion,

${\text{Δ}}_{fus}\text{H}$ is change in enthalpy of fusion,

${\text{T}}_{\text{f}}$ is the melting temperature.