
Concept explainers
Interpretation:
The Lewis structure of vinyl chloride, repeating units of vinyl chloride, and the enthalpy change are to be calculated.
Concept Introduction:
The standard enthalpy for a reaction is the amount of enthalpy change that occurs to occur understandard conditions(room temperature and pressure)
The enthalpy of reaction can be calculated as:
Here, BE represents the average value of bond enthalpy.

Answer to Problem 124AP
Solution:
(a)
(b)
(c)
Explanation of Solution
a)The Lewis structure of vinyl chloride
There are a total of 18 electrons in
The skeletal structure for
The Lewis structure for
b)Draw a portion of the molecule showing three
The poly vinyl chloride has the repeating chain of
The portion of poly vinyl chloride for three repeating chain of
Given information:
Mass,
c) The enthalpy change when
The molar mass of vinyl chloride is
The moles of vinyl chloride can be calculated as:
Substitute
The enthalpy of reaction can be calculated as:
From table 8.6, the enthalpy of formation values are:
Now, the standard enthalpy of a given reaction is:
Substitute,
The heat released is
Substitute
Hence, the enthalpy change is
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Chapter 8 Solutions
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