4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 20 L. The amount of heat absorbed in this expansion is ___________ L atm.
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✗ Incorrect. Try again or view the solution.
Solution
For free expansion:
$$
\begin{aligned}
& P_{e x t}=0, w=0 \\
& q=0, \Delta U=0
\end{aligned}
$$
Ans. 0
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