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plz help.Conceptual doubt. H(enthaly)=E+PV Differentiating,we get, H = E + (PV) =nC v dT + P V + V P =nC v dT + nR T + V P For isothermal process,dT=0, T=0 hence, H = 0 + 0 + V P = V P BUT FOR ISOTHERMAL PROCESSES, IT IS SAID U=0, H=0 EXPLAIN!!!!!!!!!!!!!!!


plz help.Conceptual doubt.


H(enthaly)=E+PV


Differentiating,we get,H = E + (PV)


     =nCvdT  + PV + VP


     =nCvdT + nRT + VP


For isothermal process,dT=0,T=0


hence, H = 0 + 0 + VP  =  VP


BUT FOR ISOTHERMAL PROCESSES, IT IS SAID  U=0,H=0


EXPLAIN!!!!!!!!!!!!!!!


 


 


Grade:upto college level

1 Answers

Naveen Kumar
askIITians Faculty 60 Points
8 years ago
H=U=PV
differentiating,
dH=dU+d(PV)
put PV=nRT
dH=dU+nRdT
Now if the process is isotermal,
dT=0
and if dU=0
then dH=0
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