   Chapter 12, Problem 35PS

Chapter
Section
Textbook Problem

Benzene, C6H6, is an organic liquid that freezes at 5.5 °C (Figure 11.1) to form beautiful, feather-like crystals. How much energy is evolved as heat when 15.5 g of benzene freezes at 5.5 °C? (The enthalpy of fusion of benzene is 9.95 kJ/mol.) If the 15.5-g sample is remelted, again at 5.5 °C, what quantity of energy is required to convert it to a liquid?

Interpretation Introduction

Interpretation:

The energy that is evolved as heat when benzene freezes and the energy that is required to convert benzene to its liquid has to be calculated.

Concept introduction:

Mass of the compound is calculated by using following formula,

Numberofmoles = massmolarmass

Explanation

Massofbenzene=15.5gMolarMassofbenzene=78.11g/moleNumberofmoles = massmolarmassNumberofmoles = 15.578.11g/mole=0.1984molesThe ΔHfus = 9

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