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What is the enthalpy change when 3mol of liqili benzene transform to the vapor state at ist boiling point 80degree and at 1bar pressure

What is the enthalpy change when 3mol of liqili benzene transform to the vapor state at ist boiling point 80degree and at 1bar pressure

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Grade:12th pass

2 Answers

Arun
25750 Points
4 years ago
Dear student
 
change in enthalpy, dH = dU + pdV= dU + dn*R*T
As the change is occuring at the boiling temperature, dH = 3*R*T
use T = 273+80=353K.
Vikas TU
14149 Points
3 years ago
Dear student 
You already determined the ΔS for benzene at 353 K by dividing the ΔH at 353 K by the temperature 353 K. Now all you need to do is determine the ΔH at 343 K using Hess' law? Once you do that, you can get the ΔS at 343 K.

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