   Chapter 10, Problem 97E

Chapter
Section
Textbook Problem

A substance, X, has the following properties: Specific Heat Capacities ∆Hvap 20.kj/mol C(s) 3.0j/g∙°C ∆Hfus 5.0kj/mol C(l) 2.5j/g∙°C bp 75°C C(g) 2.5j/g∙°C mp −15°C

Interpretation Introduction

Interpretation: The heating curve of given substance X should be drawn.

Concept introduction:

Heating curve:

• The plot of temperature change against heat added at constant rate is called heating curve.
• The plateau of the curve is meant by the melting and freezing points of the substances.
Explanation

Explanation

Record the given data;

The melting of substance X=-15°CThe boiling  of substance X=70°CSpecific heat capacitieCs=3.0J/g.°CSpecific heat capacitieCl=2.5J/g.°CSpecific heat capacitieCg=1.0J/g

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