4 Dec 2021
Problem 77
Page 475
Section: Cumulative Problems
Chapter 11: Liquids, Solids, and Intermolecular Forces
Textbook ExpertVerified Tutor
4 Dec 2021
Given information
Draw a heating curve (such as the one in Figure 11.30) for 
of methanol beginning at 
and ending at 
.Assume that the values given here are constant over the relevant temperature ranges.
Melting point 
Boiling point 
Step-by-step explanation
Step 1.
The heating curve for one mole of methanol:
Based on the data given here for of methanol a graph can be drawn with Temperature in 
on 
and heat added in 
on the 
.
of methanol a graph can be drawn with Temperature in on and heat added in on the . Thus this graph which is drawn with the temperature as a function of heat added while heating one mole of methanol is the heating curve for one mole of methanol.
One mole of methanol is heated starting from to .
to .The heating curve for one mole of methanol is as shown below and it shows the five different stages in this process:
Stage I: One-mole methanol is heated from to .
to . Stage II: Once methanol reaches it starts melting,as is the melting point of methanol. As this is a phase change process temperature is constant in this stage. And the heat added, 
is used to melt solid methanol into liquid methanol.
it starts melting,as is the melting point of methanol. As this is a phase change process temperature is constant in this stage. And the heat added, is used to melt solid methanol into liquid methanol.Stage III: Liquid methanol is heated from to .
to .Stage IV: Liquid methanol at vaporizes and changes to a gaseous state as this is the boiling point of methanol. Here 
is the heat added for the vaporization of methanol as .
vaporizes and changes to a gaseous state as this is the boiling point of methanol. Here is the heat added for the vaporization of methanol as . Stage V: Gaseous methanol at is heated to
is heated to 
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Principles of Chemistry Molecular Approach
3rd Edition, 2014
Tro
ISBN: 9780321971944