Question

When ideal gas expands in vacuum, the work done by the gas is equal to

• A. PV
• B. RT
• C. 0
• D. nRT

Answer 1

Answer: (C)

$W_{irr}=-P_{ext}\frac{R[P_1{T}_2-P_2{T}_1]}{P_1{P}_2}$
During expansion in vaccum P_ext = 0
$\therefore$work done = 0.