1.

One mole of an ideal gas is expanded isothermally at 300 K from 10 atm to 1 atm. Calculate q, w, DeltaU&DeltaH under the following conditions. (i) Expansion is carried out reversibly. (ii) Expansion is carried out irreversibly

Answer»

SOLUTION :Isothermal process
(i) For ideal gas `DeltaU=0" "DeltaH=0`
Q = -W
`w_("rev")=-nRT"ln"P_(1)/P_(2)=-1xxRxx300"ln"10/1=-690.9R`
(ii) `W_("irrev")=-P_("ext")(V_(2)-V_(1))=-P_("ext")((nRT)/P_(2)-(nRT)/P_(1))`
= `-1xx1xxRxx300[1/1-1/10]=-270R`


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