a. Calculate the heat required to melt 8.02 g of benzene at its normal melting point. Heat of fusion (benzene) = 9.92 kJ/mol Heat = kJ b. Calculate the heat required to vaporize 8.02 g of benzene at its normal boiling point. Heat of vaporization (benzene) = 30.7 kJ/mol Heat = kJ c. Why is the heat of vaporization more than three times the heat of fusion? O In the liquid state, intermolecular forces must be broken, while in the solid state intramolecular forces must be broken. O Forces holding molecules in the liquid state are much stronger than in the solid state. O More energy is required to overcome the forces holding the molecules together in the liquid state (/ to g) than to just allow the molecules to begin moving (s to /)
a. Calculate the heat required to melt 8.02 g of benzene at its normal melting point. Heat of fusion (benzene) = 9.92 kJ/mol Heat = kJ b. Calculate the heat required to vaporize 8.02 g of benzene at its normal boiling point. Heat of vaporization (benzene) = 30.7 kJ/mol Heat = kJ c. Why is the heat of vaporization more than three times the heat of fusion? O In the liquid state, intermolecular forces must be broken, while in the solid state intramolecular forces must be broken. O Forces holding molecules in the liquid state are much stronger than in the solid state. O More energy is required to overcome the forces holding the molecules together in the liquid state (/ to g) than to just allow the molecules to begin moving (s to /)
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter9: Liquids And Solids
Section: Chapter Questions
Problem 98E
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The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Question
Transcribed Image Text:a. Calculate the heat required to melt 8.02 g of benzene at its normal melting point.
Heat of fusion (benzene) = 9.92 kJ/mol
Heat =
kJ
b. Calculate the heat required to vaporize 8.02 g of benzene at its normal boiling point.
Heat of vaporization (benzene)
= 30.7 kJ/mol
Heat =
kJ
c. Why is the heat of vaporization more than three times the heat of fusion?
In the liquid state, intermolecular forces must be broken, while in the solid state intramolecular forces must be broken.
Forces holding molecules in the liquid state are much stronger than in the solid state.
More energy is required to overcome the forces holding the molecules together in the liquid state (/ to g) than to just allow the molecules to begin moving (s to /).
Expert Solution
Step 1
Given data,
Mass of benzene = 8.02 g
Heat of fusion = 9.92 kJ/mol
Heat of vaporization = 30.7 kJ/mol
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