Chemistry Class-11: Chapter –6. Thermodynamics Part – 12

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Question: 62

Graphically show the total work done in an expansion when the state of an ideal gas is changed reversibly and isothermally . With the help of a plot compare the work done in the above case with that carried out against a constant external pressure .

Answer:

(i) Reversible Work is represented by the combined areas

Isothermal Change

constant external pressure

and

Reversible Work

Reversible work

(ii) Work against constant pressure, is represented by the area

Constant Pressure

Constant pressure