
Concept explainers
Calculated the heat released when 84.6 g of gaseous ethanol at

Interpretation:
The heat required for the conversion of
Concept Introduction:
Molar heat of evaporation is the heat required for a mole of liquid to convert it into gas without changing the temperature.
Specific heat of a substance is the heat required for the substance to increase the temperature of
Answer to Problem 40QP
Solution:
The heat required for the conversion of
Explanation of Solution
The heat required is calculated by a three-step process. The first step involves the cooling of gaseous ethanol from
The heat change associated with the given process is given by the expression as shown below.
Here,
Now, heat released in the cool of gaseous ethanol is calculated by considering the temperature change from
So, the temperature change is calculated as shown below.
So, theheat released is calculated as,
So, the number moles of ethanol in
Now, the heat of vaporization for ethanol is
Now, the heat released in the cool of liquid ethanol is calculated by considering the temperature change from
The temperature change is calculated as shown below.
So, the heat released is calculated as shown below.
Total heat released is the sum of the above three steps.
The total heat change associated with the given process is
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Chapter 10 Solutions
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