
Interpretation:
To calculate the heat change in region A, B and C for benzene.
Concept Introduction :
When matter transitions from one state (

Answer to Problem 10STP
Explanation of Solution
For methanol, in region B, temperature change from
Initial temperature in
Final temperature in
Molar mass of methanol is
No. of mol is 1.
So, mass of benzene is
Specific heat for methanol is
Now calculate heat change in region B
In region A, an only phase transition occurs from solid to liquid. So, heat absorbed will be equal to enthalpy of fusion.
The enthalpy of fusion for benzene is
No. of mol given is 1 mol.
Thus, heat absorbed will be
In region C, an only phase transition occurs from liquid to gas. So, heat absorbed will be equal to enthalpy of vaporization.
The enthalpy of vaporization for benzene is
No. of mol given is 1 mol.
Thus, heat absorbed will be
So, total heat absorbed in region A, B and C is,
Thus, total heat absorbed is
Chapter 17 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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