First slide

Work

Question

During expansion of a gas into vaccum (P_ext= 0), work done is zero if the process is
A) Reversible B) Irreversible C) Isothermal

Easy

A

A, B & C
B

A, B only
C

A, C only
D

B, C only

Solution

Isothermal process,
$∆ T = 0, ∆ E = 0, since P_{ext} = 0, q = - W = 0;$
Irreversible process ;
$W = - P_{ext} ∆ V; P_{ext} = 0, W = 0$
Reversible process ;
$W = - nRT \ln \frac{P_{1}}{P_{2}}; P_{int} = P_{ext} \pm dp; Thus w = 0$

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