Answer to Question #187789 in Molecular Physics | Thermodynamics for nowela padal

Question #187789

A 2.0 mol. sample of an ideal gas is kept at 1.0◦c during an expansion from 2.0 L to 9.0 how much energy transfer by heat occurs with the surroundings in this process?


1
Expert's answer
2021-05-04T06:29:08-0400

Answer :-


give

mole = 2

VA= 2 L

VB = 9 L

T = 1oC

R = 8.3 J/K

first law of thermodynamics is 

ΔU=QWΔ U=Q−W


 if the temperature is held constant, the internal energy of the system also is constant, and so 

ΔU=0

. From the first law of thermodynamics, it follows that 

Q=W\boxed{Q=−W}

 for this same isothermal process.


also work

WAB=nRTlnVBVA\boxed{W_{A→B}=nRTln\frac{⁡V_B}{V_A }}



Q=nRTlnVBVAQ = - nRTln\frac{⁡V_B}{V_A }


=(2)×(8.3)×(273)ln92(2)\times(8.3)\times(273)ln\frac{⁡9}{2 }


= 6797.7 joule


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