Question

Work done in a free expansion process is
A) Minimun
B) 0
C) Maximum
D) None of the above

Answer 1

Hola User______________

HEre is Your Answer..!!
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↪Actually welcome to the concept of the THERMODYNAMICS..

↪Basically we know that the work done by a gas is given as ...

↪W = - P (external ) dV

↪such that here the gas is in free expansion the External pressure of the piston is ZERO( Vacuum Condition ) ..THUS

↪WE CAN SAY THAT THE WORK DONE IN THE FREE EXPANSION IS ZERO..
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⭐Hope it helps u...☺

Answer 2

As free expansion is irreversible process

and in free expansion there is no change in temperature

So change in internal energy = 0

Also there is no change in surroundings

So heat energy given = 0

As heat energy given = change in internal internal Energy + work done by the system

Hence work done = heat - change in internal
energy

= 0-0 = 0

So no work is done in free expansion process

OR

AS work done is integration of P( external)dv

As during free expansion, External pressure is zero

So work done =0

let's see for isothermal process

As in isothermal internal energy is 0

due to no change in temperature

therefore Heat energy given = work done

As heat energy given= 0 due to no change in surrounding, So work done = 0


For adiabatic process

As heat energy given= 0

so change in internal energy = work done by system

As change in internal energy is zero due to no change in temperature

hence work done is zero


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