
(a)
Interpretation:
The reason for the heat of fusion of aluminum to be much smaller than the heat of vaporization is to be determined.
Concept introduction:
The heat of fusion is the amount of heat energy required to change the state of
The heat of vaporization is the amount of heat energy required to change the state of
(a)

Answer to Problem 22A
From the
Explanation of Solution
In a solid state, aluminum molecules are packed in a crystalline form. Heat of fusion converts the solid aluminum into liquid, in liquid state the aluminum molecules are enough close together, so most of the intermolecular forces are still present.
Whereas, heat of vaporization converts liquid aluminum into gas, in gaseous state the aluminum molecules are far apart, so all of the intermolecular forces must be overcome and require large amount of energy.
As the distance between molecules increases and the force of attraction decreases, the amount of energy required increases.
(b)
Interpretation:
The amount of heat required to vaporize aluminum at its normal boiling point is to be determined.
Concept introduction:
The amount of heat required to change the state of
(b)

Answer to Problem 22A
The amount of heat required to vaporize
Explanation of Solution
Given Information:
Heat of vaporization
Mass of aluminum
Calculation:
According to the heat of vaporization,
Moles of
Moles = mass / molar mass
So,
(c)
Interpretation:
The amount of heat evolved to freeze aluminum at its normal freezing point is to be determined.
Concept introduction:
The amount of heat evolved to change the state of
(c)

Answer to Problem 22A
The amount of heat evolved to freeze
Explanation of Solution
Given Information:
Heat of fusion
Mass of aluminum
Calculation:
According to the heat of fusion,
Moles of
Moles = mass / molar massM
So,
As the heat is evolved during this process, hence the amount of heat would have negative sign.
Therefore, the heat evolved during the freezing process of liquid aluminum is
(d)
Interpretation:
The amount of heat evolved to freeze aluminum at its normal melting point is to be determined.
Concept introduction:
The amount of heat required to change the state of 1 mole of solid to vapor at its normal melting point is called as heat of fusion.
(d)

Answer to Problem 22A
The amount of heat required to melt
Explanation of Solution
Given Information:
Heat of fusion
Mole of aluminum
According to the heat of fusion,
So,
Hence the amount of heat required to melt
Chapter 14 Solutions
World of Chemistry
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