Chapter 8, Problem 8.94AP

(a)

Interpretation Introduction

Interpretation:

The amount of heat in kilocalories required to vaporize $\text{3}\text{mol}\text{of}{\text{H}}_{\text{2}}\text{O}$ should be calculated using the given heat of vaporization.

Concept introduction:

Heat of fusion: It is defined as the amount of heat required to melt a substance completely once it reaches its melting point.

Heat of vaporization: It is defined as the quantity of heat required to vaporize a substance completely once it reaches its boiling point.

Amount of heat required to produce a given temperature change can be given by the equation:

$\text{Heat}\left(\text{cal}\text{or}\text{J}\right)\text{=}\text{Mass}\left(\text{g}\right)\text{×}\text{Temperature}\text{change}\left(\text{°C}\right)\text{×}\text{Specific}\text{heat}\left(\frac{\text{cal}\text{or}\text{J}}{\text{g×}\text{°C}}\right)$

(b)

Interpretation Introduction

Interpretation:

The amount of heat in kilocalories released by the condensation of $\text{320}\text{g}\text{of}\text{steam}$ should be calculated using the given heat of vaporization.

Concept introduction:

Heat of fusion: It is defined as the amount of heat required to melt a substance completely once it reaches its melting point.

Heat of vaporization: It is defined as the quantity of heat required to vaporize a substance completely once it reaches its boiling point.

Amount of heat required to produce a given temperature change can be given by the equation:

$\text{Heat}\left(\text{cal}\text{or}\text{J}\right)\text{=}\text{Mass}\left(\text{g}\right)\text{×}\text{Temperature}\text{change}\left(\text{°C}\right)\text{×}\text{Specific}\text{heat}\left(\frac{\text{cal}\text{or}\text{J}}{\text{g×}\text{°C}}\right)$