Question

Five moles of an ideal gas at $1$ bar and $298 \,K$ is expanded into vacuum to double the volume. The work done is :-

• A. $C _{ V }\left( T _{2}- T _{1}\right)$
• B. $- RT \ln V _{2} / V _{1}$
• C. $- RT \left( V _{2}- V _{1}\right)$
• D. zero

Answer 1

Answer: (D)

As the expansion is done in vaccum that is in absence of $p _{\text {ext }}$ so

$W =$ zero